{"id":132341,"date":"2026-10-27T15:04:59","date_gmt":"2026-10-27T08:04:59","guid":{"rendered":"https:\/\/tino.vn\/blog\/?p=132341"},"modified":"2026-10-27T15:06:35","modified_gmt":"2026-10-27T08:06:35","slug":"sua-loi-khong-vao-duoc-vps","status":"publish","type":"post","link":"https:\/\/tino.vn\/blog\/sua-loi-khong-vao-duoc-vps\/","title":{"rendered":"Nguy\u00ean nh\u00e2n v\u00e0 c\u00e1ch s\u1eeda l\u1ed7i kh\u00f4ng v\u00e0o \u0111\u01b0\u1ee3c VPS"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>\u0110\u1ec3 s\u1eeda l\u1ed7i kh\u00f4ng v\u00e0o \u0111\u01b0\u1ee3c VPS, b\u1ea1n c\u1ea7n x\u00e1c \u0111\u1ecbnh l\u1ed7i n\u1eb1m \u1edf \u0111\u00e2u tr\u01b0\u1edbc khi ch\u1ec9nh b\u1ea5t c\u1ee9 th\u1ee9 g\u00ec: VPS c\u00f3 \u0111ang ch\u1ea1y kh\u00f4ng, k\u1ebft n\u1ed1i c\u00f3 t\u1edbi \u0111\u01b0\u1ee3c port SSH (22) ho\u1eb7c Remote Desktop (3389) kh\u00f4ng, v\u00e0 th\u00f4ng tin \u0111\u0103ng nh\u1eadp c\u00f3 \u0111\u00fang kh\u00f4ng. Ph\u1ea7n l\u1edbn tr\u01b0\u1eddng h\u1ee3p \u0111\u1ebfn t\u1eeb firewall ch\u1eb7n port, d\u1ecbch v\u1ee5 SSH ho\u1eb7c Remote Desktop b\u1ecb d\u1eebng, \u0111\u1ed5i port nh\u01b0ng qu\u00ean m\u1edf firewall, sai m\u1eadt kh\u1ea9u hay SSH key, ho\u1eb7c VPS qu\u00e1 t\u1ea3i. H\u01b0\u1edbng d\u1eabn d\u01b0\u1edbi \u0111\u00e2y gi\u00fap b\u1ea1n \u0111\u1ecdc \u0111\u00fang th\u00f4ng b\u00e1o l\u1ed7i v\u00e0 kh\u1eafc ph\u1ee5c chi ti\u1ebft.<\/strong><\/p>\n\n\n\n<h2 id=\"T\u1ea1i_sao_kh\u00f4ng_v\u00e0o_\u0111\u01b0\u1ee3c_VPS?_\"><strong>T\u1ea1i sao kh\u00f4ng v\u00e0o \u0111\u01b0\u1ee3c VPS? <\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00ecnh tr\u1ea1ng <strong>kh\u00f4ng k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c VPS<\/strong> c\u00f3 th\u1ec3 xu\u1ea5t ph\u00e1t t\u1eeb m\u00e1y t\u00ednh c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, \u0111\u01b0\u1eddng truy\u1ec1n m\u1ea1ng ho\u1eb7c c\u1ea5u h\u00ecnh b\u00ean trong m\u00e1y ch\u1ee7. X\u00e1c \u0111\u1ecbnh \u0111\u00fang nguy\u00ean nh\u00e2n s\u1ebd gi\u00fap b\u1ea1n tr\u00e1nh thay \u0111\u1ed5i nh\u1eefng thi\u1ebft l\u1eadp kh\u00f4ng li\u00ean quan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D\u01b0\u1edbi \u0111\u00e2y l\u00e0 9 nguy\u00ean nh\u00e2n th\u01b0\u1eddng g\u1eb7p:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>VPS \u0111ang t\u1eaft ho\u1eb7c g\u1eb7p s\u1ef1 c\u1ed1 h\u1ec7 th\u1ed1ng:<\/strong> M\u00e1y ch\u1ee7 c\u00f3 th\u1ec3 \u0111ang kh\u1edfi \u0111\u1ed9ng l\u1ea1i, b\u1ecb treo h\u1ec7 \u0111i\u1ec1u h\u00e0nh, g\u1eb7p l\u1ed7i kh\u1edfi \u0111\u1ed9ng ho\u1eb7c b\u1ecb nh\u00e0 cung c\u1ea5p t\u1ea1m ng\u1eebng d\u1ecbch v\u1ee5. Khi \u0111\u00f3, c\u00e1c k\u1ebft n\u1ed1i SSH v\u00e0 Remote Desktop \u0111\u1ec1u c\u00f3 th\u1ec3 th\u1ea5t b\u1ea1i.<\/li>\n\n\n\n<li><strong>S\u1eed d\u1ee5ng sai \u0111\u1ecba ch\u1ec9 IP:<\/strong> Nh\u1eadp nh\u1ea7m \u0111\u1ecba ch\u1ec9 IP, s\u1eed d\u1ee5ng IP c\u0169 ho\u1eb7c k\u1ebft n\u1ed1i qua t\u00ean mi\u1ec1n c\u00f3 b\u1ea3n ghi <a href=\"https:\/\/tino.vn\/blog\/dns-la-gi\/\" target=\"_blank\" data-type=\"post\" data-id=\"236\" rel=\"noreferrer noopener\">DNS<\/a> ch\u01b0a ch\u00ednh x\u00e1c c\u00f3 th\u1ec3 khi\u1ebfn y\u00eau c\u1ea7u truy c\u1eadp \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn sai m\u00e1y ch\u1ee7.<\/li>\n\n\n\n<li><strong>Nh\u1eadp sai c\u1ed5ng k\u1ebft n\u1ed1i:<\/strong> SSH tr\u00ean Linux th\u01b0\u1eddng s\u1eed d\u1ee5ng TCP 22, c\u00f2n Remote Desktop tr\u00ean Windows th\u01b0\u1eddng s\u1eed d\u1ee5ng TCP 3389. N\u1ebfu c\u1ed5ng \u0111\u00e3 \u0111\u01b0\u1ee3c thay \u0111\u1ed5i, s\u1eed d\u1ee5ng th\u00f4ng s\u1ed1 m\u1eb7c \u0111\u1ecbnh s\u1ebd kh\u00f4ng th\u1ec3 k\u1ebft n\u1ed1i \u0111\u00fang d\u1ecbch v\u1ee5.<\/li>\n\n\n\n<li><strong>D\u1ecbch v\u1ee5 SSH ho\u1eb7c Remote Desktop ng\u1eebng ho\u1ea1t \u0111\u1ed9ng:<\/strong> Khi d\u1ecbch v\u1ee5 ti\u1ebfp nh\u1eadn k\u1ebft n\u1ed1i b\u1ecb d\u1eebng, l\u1ed7i c\u1ea5u h\u00ecnh ho\u1eb7c kh\u00f4ng kh\u1edfi \u0111\u1ed9ng th\u00e0nh c\u00f4ng, ng\u01b0\u1eddi d\u00f9ng s\u1ebd kh\u00f4ng th\u1ec3 \u0111\u0103ng nh\u1eadp t\u1eeb xa d\u00f9 h\u1ec7 \u0111i\u1ec1u h\u00e0nh v\u1eabn ho\u1ea1t \u0111\u1ed9ng.<\/li>\n\n\n\n<li><strong>T\u01b0\u1eddng l\u1eeda ch\u1eb7n k\u1ebft n\u1ed1i:<\/strong> T\u01b0\u1eddng l\u1eeda tr\u00ean VPS ho\u1eb7c l\u1edbp b\u1ea3o m\u1eadt m\u1ea1ng c\u1ee7a nh\u00e0 cung c\u1ea5p c\u00f3 th\u1ec3 ch\u1eb7n nh\u1eefng c\u1ed5ng c\u1ea7n thi\u1ebft. \u0110\u00e2y l\u00e0 nguy\u00ean nh\u00e2n \u0111\u00e1ng ki\u1ec3m tra khi v\u1eeba thay \u0111\u1ed5i c\u1ea5u h\u00ecnh b\u1ea3o m\u1eadt.<\/li>\n\n\n\n<li><strong>Sai t\u00e0i kho\u1ea3n, m\u1eadt kh\u1ea9u ho\u1eb7c SSH Key:<\/strong> Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 nh\u1eadp sai th\u00f4ng tin \u0111\u0103ng nh\u1eadp, s\u1eed d\u1ee5ng kh\u00f3a SSH kh\u00f4ng kh\u1edbp, t\u00e0i kho\u1ea3n b\u1ecb kh\u00f3a ho\u1eb7c kh\u00f4ng \u0111\u01b0\u1ee3c c\u1ea5p quy\u1ec1n truy c\u1eadp t\u1eeb xa.<\/li>\n\n\n\n<li><strong>\u0110\u1ecba ch\u1ec9 IP b\u1ecb ch\u1eb7n b\u1edfi h\u1ec7 th\u1ed1ng b\u1ea3o m\u1eadt:<\/strong> C\u00e1c c\u00f4ng c\u1ee5 nh\u01b0 Fail2ban c\u00f3 th\u1ec3 t\u1ea1m th\u1eddi ch\u1eb7n \u0111\u1ecba ch\u1ec9 IP sau nhi\u1ec1u l\u1ea7n \u0111\u0103ng nh\u1eadp th\u1ea5t b\u1ea1i. Quy t\u1eafc gi\u1edbi h\u1ea1n truy c\u1eadp theo IP c\u0169ng c\u00f3 th\u1ec3 khi\u1ebfn ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng th\u1ec3 k\u1ebft n\u1ed1i khi chuy\u1ec3n sang m\u1ea1ng kh\u00e1c.<\/li>\n\n\n\n<li><strong>VPS qu\u00e1 t\u1ea3i ho\u1eb7c h\u1ebft t\u00e0i nguy\u00ean:<\/strong> CPU ho\u1ea1t \u0111\u1ed9ng qu\u00e1 t\u1ea3i, RAM c\u1ea1n ki\u1ec7t ho\u1eb7c \u1ed5 \u0111\u0129a \u0111\u1ea7y c\u00f3 th\u1ec3 khi\u1ebfn VPS ph\u1ea3n h\u1ed3i ch\u1eadm, d\u1ecbch v\u1ee5 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng ho\u1eb7c kh\u00f4ng th\u1ec3 t\u1ea1o phi\u00ean \u0111\u0103ng nh\u1eadp m\u1edbi.<\/li>\n\n\n\n<li><strong>S\u1ef1 c\u1ed1 \u0111\u01b0\u1eddng truy\u1ec1n ho\u1eb7c c\u1ea5u h\u00ecnh m\u1ea1ng:<\/strong> L\u1ed7i \u0111\u1ecbnh tuy\u1ebfn, k\u1ebft n\u1ed1i Internet kh\u00f4ng \u1ed5n \u0111\u1ecbnh, c\u1ea5u h\u00ecnh VPN sai ho\u1eb7c s\u1ef1 c\u1ed1 t\u1ea1i nh\u00e0 cung c\u1ea5p m\u1ea1ng c\u0169ng c\u00f3 th\u1ec3 l\u00e0m gi\u00e1n \u0111o\u1ea1n vi\u1ec7c truy c\u1eadp VPS.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-1-1024x549.png\" alt=\"T\u1ea1i sao kh\u00f4ng v\u00e0o \u0111\u01b0\u1ee3c VPS?\" class=\"wp-image-132508\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-1-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-1-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-1-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-1-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-1-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>T\u1ea1i sao kh\u00f4ng v\u00e0o \u0111\u01b0\u1ee3c VPS?<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<h2 id=\"C\u00e1ch_x\u00e1c_\u0111\u1ecbnh_nguy\u00ean_nh\u00e2n_VPS_kh\u00f4ng_k\u1ebft_n\u1ed1i_\u0111\u01b0\u1ee3c\"><strong>C\u00e1ch x\u00e1c \u0111\u1ecbnh nguy\u00ean nh\u00e2n VPS kh\u00f4ng k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1edbc khi thay \u0111\u1ed5i c\u1ea5u h\u00ecnh m\u00e1y ch\u1ee7, b\u1ea1n n\u00ean ki\u1ec3m tra th\u00f4ng b\u00e1o l\u1ed7i v\u00e0 kh\u1ea3 n\u0103ng k\u1ebft n\u1ed1i m\u1ea1ng. \u0110\u00e2y l\u00e0 c\u00e1ch nhanh nh\u1ea5t \u0111\u1ec3 khoanh v\u00f9ng s\u1ef1 c\u1ed1 v\u00e0 l\u1ef1a ch\u1ecdn gi\u1ea3i ph\u00e1p ph\u00f9 h\u1ee3p.<\/p>\n\n\n\n<h3 id=\"Nh\u1eadn_bi\u1ebft_l\u1ed7i_qua_th\u00f4ng_b\u00e1o_k\u1ebft_n\u1ed1i\"><strong>Nh\u1eadn bi\u1ebft l\u1ed7i qua th\u00f4ng b\u00e1o k\u1ebft n\u1ed1i<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed7i th\u00f4ng b\u00e1o l\u1ed7i th\u01b0\u1eddng ph\u1ea3n \u00e1nh m\u1ed9t nh\u00f3m nguy\u00ean nh\u00e2n kh\u00e1c nhau.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Th\u00f4ng b\u00e1o l\u1ed7i<\/strong><\/td><td><strong>Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3 g\u1eb7p<\/strong><\/td><td><strong>H\u01b0\u1edbng x\u1eed l\u00fd<\/strong><\/td><\/tr><tr><td>Connection timed out<\/td><td>G\u00f3i tin kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i trong th\u1eddi gian cho ph\u00e9p<\/td><td>Ki\u1ec3m tra IP, \u0111\u01b0\u1eddng truy\u1ec1n, t\u01b0\u1eddng l\u1eeda v\u00e0 tr\u1ea1ng th\u00e1i VPS<\/td><\/tr><tr><td>Connection refused<\/td><td>K\u1ebft n\u1ed1i TCP b\u1ecb t\u1eeb ch\u1ed1i<\/td><td>Ki\u1ec3m tra c\u1ed5ng, d\u1ecbch v\u1ee5 SSH v\u00e0 quy t\u1eafc t\u1eeb ch\u1ed1i k\u1ebft n\u1ed1i<\/td><\/tr><tr><td>Permission denied<\/td><td>X\u00e1c th\u1ef1c SSH th\u1ea5t b\u1ea1i<\/td><td>Ki\u1ec3m tra t\u00e0i kho\u1ea3n, SSH Key v\u00e0 ch\u00ednh s\u00e1ch \u0111\u0103ng nh\u1eadp<\/td><\/tr><tr><td>Network is unreachable<\/td><td>M\u00e1y kh\u00e1ch kh\u00f4ng t\u00ecm \u0111\u01b0\u1ee3c \u0111\u01b0\u1eddng m\u1ea1ng ph\u00f9 h\u1ee3p<\/td><td>Ki\u1ec3m tra Internet, VPN v\u00e0 \u0111\u1ecbnh tuy\u1ebfn<\/td><\/tr><tr><td>Host key verification failed<\/td><td>Kh\u00f3a \u0111\u1ecbnh danh m\u00e1y ch\u1ee7 kh\u00f4ng kh\u1edbp v\u1edbi th\u00f4ng tin \u0111\u00e3 l\u01b0u<\/td><td>X\u00e1c minh danh t\u00ednh m\u00e1y ch\u1ee7 v\u00e0 SSH host key<\/td><\/tr><tr><td>Remote Desktop can&#8217;t connect<\/td><td>Kh\u00f4ng thi\u1ebft l\u1eadp \u0111\u01b0\u1ee3c phi\u00ean Remote Desktop<\/td><td>Ki\u1ec3m tra RDP, c\u1ed5ng 3389 v\u00e0 Windows Firewall<\/td><\/tr><tr><td>Your credentials did not work<\/td><td>Th\u00f4ng tin x\u00e1c th\u1ef1c Windows kh\u00f4ng \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn<\/td><td>Ki\u1ec3m tra t\u00e0i kho\u1ea3n, m\u1eadt kh\u1ea9u v\u00e0 quy\u1ec1n \u0111\u0103ng nh\u1eadp<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>L\u01b0u \u00fd:<\/strong> C\u00e1c th\u00f4ng b\u00e1o tr\u00ean gi\u00fap khoanh v\u00f9ng nguy\u00ean nh\u00e2n, kh\u00f4ng ph\u1ea3i k\u1ebft lu\u1eadn tuy\u1ec7t \u0111\u1ed1i. Ch\u1eb3ng h\u1ea1n, Connection timed out c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n khi t\u01b0\u1eddng l\u1eeda ch\u1eb7n l\u01b0u l\u01b0\u1ee3ng ho\u1eb7c \u0111\u01b0\u1eddng truy\u1ec1n g\u1eb7p s\u1ef1 c\u1ed1.<\/p>\n\n\n\n<h3 id=\"Ki\u1ec3m_tra_VPS,_\u0111\u1ecba_ch\u1ec9_IP_v\u00e0_c\u1ed5ng_k\u1ebft_n\u1ed1i\"><strong>Ki\u1ec3m tra VPS, \u0111\u1ecba ch\u1ec9 IP v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c thao t\u00e1c sau tr\u00ean m\u00e1y t\u00ednh Windows tr\u01b0\u1edbc khi truy c\u1eadp ph\u1ea7n qu\u1ea3n tr\u1ecb VPS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u01b0\u1edbc 1:<\/strong> \u0110\u0103ng nh\u1eadp v\u00e0o b\u1ea3ng qu\u1ea3n tr\u1ecb c\u1ee7a nh\u00e0 cung c\u1ea5p VPS v\u00e0 x\u00e1c \u0111\u1ecbnh:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>M\u00e1y ch\u1ee7 \u0111ang \u1edf tr\u1ea1ng th\u00e1i Running hay Stopped.<\/li>\n\n\n\n<li>\u0110\u1ecba ch\u1ec9 IPv4 ho\u1eb7c IPv6 \u0111\u01b0\u1ee3c c\u1ea5p c\u00f3 ch\u00ednh x\u00e1c kh\u00f4ng.<\/li>\n\n\n\n<li>VPS c\u00f3 \u0111ang kh\u1edfi \u0111\u1ed9ng l\u1ea1i, b\u1ea3o tr\u00ec ho\u1eb7c b\u1ecb t\u1ea1m ng\u1eebng d\u1ecbch v\u1ee5 kh\u00f4ng.<\/li>\n\n\n\n<li>C\u00f3 c\u00f4ng c\u1ee5 Console, VNC ho\u1eb7c Serial Console \u0111\u1ec3 truy c\u1eadp tr\u1ef1c ti\u1ebfp hay kh\u00f4ng.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00ean ch\u1ee9c n\u0103ng c\u00f3 th\u1ec3 kh\u00e1c nhau gi\u1eefa c\u00e1c nh\u00e0 cung c\u1ea5p.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-2-1024x549.png\" alt=\"Ki\u1ec3m tra VPS, \u0111\u1ecba ch\u1ec9 IP v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i\" class=\"wp-image-132510\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-2-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-2-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-2-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-2-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-2-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra VPS, \u0111\u1ecba ch\u1ec9 IP v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u01b0\u1edbc 2:<\/strong> Tr\u00ean m\u00e1y t\u00ednh Windows, nh\u1ea5n <strong>Windows + R<\/strong>, nh\u1eadp <strong>cmd<\/strong> v\u00e0 nh\u1ea5n <strong>Enter<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ti\u1ebfp theo, ch\u1ea1y l\u1ec7nh:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ping DIA_CHI_IP<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong \u0111\u00f3, h\u00e3y thay <strong>DIA_CHI_IP<\/strong> b\u1eb1ng \u0111\u1ecba ch\u1ec9 IP th\u1ef1c t\u1ebf c\u1ee7a VPS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i, c\u00f3 th\u1ec3 x\u00e1c nh\u1eadn \u0111\u01b0\u1eddng truy\u1ec1n ICMP gi\u1eefa m\u00e1y t\u00ednh v\u00e0 VPS \u0111ang ho\u1ea1t \u0111\u1ed9ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ng\u01b0\u1ee3c l\u1ea1i, th\u00f4ng b\u00e1o Request timed out ch\u01b0a \u0111\u1ee7 \u0111\u1ec3 k\u1ebft lu\u1eadn VPS \u0111\u00e3 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng. M\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng ch\u1eb7n ICMP nh\u01b0ng v\u1eabn cho ph\u00e9p SSH ho\u1eb7c Remote Desktop.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-3-1024x549.png\" alt=\"Ki\u1ec3m tra VPS, \u0111\u1ecba ch\u1ec9 IP v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i\" class=\"wp-image-132511\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-3-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-3-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-3-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-3-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-3-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra VPS, \u0111\u1ecba ch\u1ec9 IP v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u01b0\u1edbc 3:<\/strong> M\u1edf Windows PowerShell v\u00e0 th\u1ef1c hi\u1ec7n l\u1ec7nh sau n\u1ebfu VPS s\u1eed d\u1ee5ng SSH tr\u00ean c\u1ed5ng 22:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Test-NetConnection DIA_CHI_IP -Port 22<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed1i v\u1edbi VPS Windows s\u1eed d\u1ee5ng Remote Desktop tr\u00ean c\u1ed5ng 3389:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Test-NetConnection DIA_CHI_IP -Port 3389<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quan s\u00e1t k\u1ebft qu\u1ea3 t\u1ea1i d\u00f2ng <strong>TcpTestSucceeded<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>True<\/strong><strong>:<\/strong> M\u00e1y t\u00ednh c\u00f3 th\u1ec3 thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i TCP \u0111\u1ebfn c\u1ed5ng \u0111\u01b0\u1ee3c ki\u1ec3m tra. \u0110i\u1ec1u n\u00e0y ch\u01b0a x\u00e1c nh\u1eadn \u0111\u0103ng nh\u1eadp th\u00e0nh c\u00f4ng.<\/li>\n\n\n\n<li><strong>False<\/strong><strong>:<\/strong> Kh\u00f4ng thi\u1ebft l\u1eadp \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i TCP \u0111\u1ebfn c\u1ed5ng t\u01b0\u01a1ng \u1ee9ng. C\u1ea7n ki\u1ec3m tra d\u1ecbch v\u1ee5, t\u01b0\u1eddng l\u1eeda v\u00e0 \u0111\u01b0\u1eddng truy\u1ec1n.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu VPS s\u1eed d\u1ee5ng c\u1ed5ng t\u00f9y ch\u1ec9nh, h\u00e3y thay 22 ho\u1eb7c 3389 b\u1eb1ng c\u1ed5ng th\u1ef1c t\u1ebf.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-4-1024x549.png\" alt=\"Ki\u1ec3m tra VPS, \u0111\u1ecba ch\u1ec9 IP v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i\" class=\"wp-image-132513\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-4-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-4-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-4-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-4-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-4-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra VPS, \u0111\u1ecba ch\u1ec9 IP v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>B\u01b0\u1edbc 4:<\/strong> B\u1ea1n c\u00f3 th\u1ec3 chuy\u1ec3n m\u00e1y t\u00ednh sang k\u1ebft n\u1ed1i Internet kh\u00e1c ho\u1eb7c s\u1eed d\u1ee5ng \u0111i\u1ec3m ph\u00e1t Wi-Fi t\u1eeb \u0111i\u1ec7n tho\u1ea1i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu VPS truy c\u1eadp \u0111\u01b0\u1ee3c t\u1eeb m\u1ea1ng m\u1edbi nh\u01b0ng th\u1ea5t b\u1ea1i \u1edf m\u1ea1ng c\u0169, h\u00e3y ki\u1ec3m tra t\u01b0\u1eddng l\u1eeda ph\u00eda m\u00e1y kh\u00e1ch, gi\u1edbi h\u1ea1n \u0111\u1ecba ch\u1ec9 IP v\u00e0 \u0111\u01b0\u1eddng truy\u1ec1n c\u1ee7a nh\u00e0 cung c\u1ea5p Internet.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-5-1024x549.png\" alt=\"Ki\u1ec3m tra VPS, \u0111\u1ecba ch\u1ec9 IP v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i\" class=\"wp-image-132514\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-5-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-5-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-5-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-5-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-5-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra VPS, \u0111\u1ecba ch\u1ec9 IP v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<h2 id=\"H\u01b0\u1edbng_d\u1eabn_s\u1eeda_l\u1ed7i_kh\u00f4ng_v\u00e0o_\u0111\u01b0\u1ee3c_VPS_Linux_qua_SSH\"><strong>H\u01b0\u1edbng d\u1eabn s\u1eeda l\u1ed7i kh\u00f4ng v\u00e0o \u0111\u01b0\u1ee3c VPS Linux qua SSH<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 kh\u1eafc ph\u1ee5c l\u1ed7i SSH tr\u00ean VPS Linux, b\u1ea1n c\u1ea7n ki\u1ec3m tra th\u00f4ng tin \u0111\u0103ng nh\u1eadp, tr\u1ea1ng th\u00e1i d\u1ecbch v\u1ee5 SSH, c\u1ea5u h\u00ecnh c\u1ed5ng, t\u01b0\u1eddng l\u1eeda v\u00e0 nh\u1eadt k\u00fd x\u00e1c th\u1ef1c.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">H\u01b0\u1edbng d\u1eabn d\u01b0\u1edbi \u0111\u00e2y t\u1eadp trung v\u00e0o Ubuntu\/Debian v\u00e0 b\u1ed5 sung nh\u1eefng \u0111i\u1ec3m kh\u00e1c bi\u1ec7t th\u01b0\u1eddng g\u1eb7p tr\u00ean AlmaLinux\/Rocky Linux.<\/p>\n\n\n\n<h3 id=\"\u0110i\u1ec1u_ki\u1ec7n_chu\u1ea9n_b\u1ecb\"><strong>\u0110i\u1ec1u ki\u1ec7n chu\u1ea9n b\u1ecb<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0110\u1ecba ch\u1ec9 IP ch\u00ednh x\u00e1c c\u1ee7a VPS.<\/li>\n\n\n\n<li>T\u00e0i kho\u1ea3n \u0111\u0103ng nh\u1eadp v\u00e0 ph\u01b0\u01a1ng th\u1ee9c x\u00e1c th\u1ef1c \u0111ang s\u1eed d\u1ee5ng.<\/li>\n\n\n\n<li>M\u00e1y t\u00ednh c\u00f3 Windows PowerShell, Xshell, PuTTY ho\u1eb7c ph\u1ea7n m\u1ec1m SSH t\u01b0\u01a1ng \u0111\u01b0\u01a1ng.<\/li>\n\n\n\n<li>Quy\u1ec1n truy c\u1eadp Console\/VNC t\u1eeb nh\u00e0 cung c\u1ea5p n\u1ebfu SSH \u0111\u00e3 b\u1ecb kh\u00f3a ho\u00e0n to\u00e0n.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quan tr\u1ecdng:<\/strong> Nh\u1eefng l\u1ec7nh qu\u1ea3n tr\u1ecb b\u00ean trong VPS y\u00eau c\u1ea7u m\u1ed9t phi\u00ean SSH c\u00f2n ho\u1ea1t \u0111\u1ed9ng ho\u1eb7c quy\u1ec1n truy c\u1eadp qua Console\/VNC. N\u1ebfu kh\u00f4ng th\u1ec3 \u0111\u0103ng nh\u1eadp SSH, h\u00e3y m\u1edf Console tr\u01b0\u1edbc khi th\u1ef1c hi\u1ec7n.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-6-1024x549.png\" alt=\"\u0110i\u1ec1u ki\u1ec7n chu\u1ea9n b\u1ecb\" class=\"wp-image-132515\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-6-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-6-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-6-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-6-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-6-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>\u0110i\u1ec1u ki\u1ec7n chu\u1ea9n b\u1ecb<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<h3 id=\"B\u01b0\u1edbc_1:_Ki\u1ec3m_tra_th\u00f4ng_tin_\u0111\u0103ng_nh\u1eadp_SSH\"><strong>B\u01b0\u1edbc 1: Ki\u1ec3m tra th\u00f4ng tin \u0111\u0103ng nh\u1eadp SSH<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ea7u ti\u00ean, h\u00e3y ki\u1ec3m tra \u0111\u1ecba ch\u1ec9 IP, t\u00ean ng\u01b0\u1eddi d\u00f9ng v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu s\u1eed d\u1ee5ng Xshell, m\u1edf c\u1ea5u h\u00ecnh phi\u00ean SSH v\u00e0 x\u00e1c nh\u1eadn:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Host:<\/strong> \u0110\u1ecba ch\u1ec9 IP c\u1ee7a VPS.<\/li>\n\n\n\n<li><strong>Protocol:<\/strong> SSH.<\/li>\n\n\n\n<li><strong>Port Number:<\/strong> C\u1ed5ng SSH th\u1ef1c t\u1ebf, th\u00f4ng th\u01b0\u1eddng l\u00e0 22.<\/li>\n\n\n\n<li><strong>User Name:<\/strong> T\u00e0i kho\u1ea3n \u0111\u01b0\u1ee3c c\u1ea5p khi kh\u1edfi t\u1ea1o VPS.<\/li>\n\n\n\n<li><strong>Authentication:<\/strong> M\u1eadt kh\u1ea9u ho\u1eb7c SSH Key theo c\u1ea5u h\u00ecnh m\u00e1y ch\u1ee7.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i Xshell, b\u1ea1n c\u0169ng c\u00f3 th\u1ec3 th\u1eed \u0111\u0103ng nh\u1eadp t\u1eeb Windows PowerShell:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ssh -p 22 username@DIA_CHI_IP<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Thay <strong>username<\/strong> b\u1eb1ng t\u00e0i kho\u1ea3n th\u1ef1c t\u1ebf v\u00e0 thay <strong>\u0111\u1ecba ch\u1ec9 IP<\/strong> minh h\u1ecda b\u1eb1ng IP c\u1ee7a VPS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu mu\u1ed1n xem chi ti\u1ebft ti\u1ebfn tr\u00ecnh k\u1ebft n\u1ed1i, s\u1eed d\u1ee5ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ssh -vvv -p 22 username@DIA_CHI_IP<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Tham s\u1ed1 <strong>-vvv<\/strong> hi\u1ec3n th\u1ecb th\u00f4ng tin g\u1ee1 l\u1ed7i, h\u1eefu \u00edch khi c\u1ea7n x\u00e1c \u0111\u1ecbnh qu\u00e1 tr\u00ecnh k\u1ebft n\u1ed1i th\u1ea5t b\u1ea1i \u1edf b\u01b0\u1edbc n\u00e0o.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-7-1024x549.png\" alt=\"Ki\u1ec3m tra th\u00f4ng tin \u0111\u0103ng nh\u1eadp SSH\" class=\"wp-image-132517\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-7-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-7-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-7-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-7-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-7-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra th\u00f4ng tin \u0111\u0103ng nh\u1eadp SSH<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><em>L\u01b0u \u00fd r\u1eb1ng kh\u00f4ng ph\u1ea3i VPS n\u00e0o c\u0169ng cho ph\u00e9p \u0111\u0103ng nh\u1eadp b\u1eb1ng t\u00e0i kho\u1ea3n root ho\u1eb7c m\u1eadt kh\u1ea9u. M\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng ch\u1ec9 ch\u1ea5p nh\u1eadn t\u00e0i kho\u1ea3n \u0111\u01b0\u1ee3c t\u1ea1o s\u1eb5n v\u00e0 SSH Key.<\/em><\/p>\n\n\n\n<h3 id=\"B\u01b0\u1edbc_2:_Ki\u1ec3m_tra_v\u00e0_kh\u1edfi_\u0111\u1ed9ng_d\u1ecbch_v\u1ee5_SSH\"><strong>B\u01b0\u1edbc 2: Ki\u1ec3m tra v\u00e0 kh\u1edfi \u0111\u1ed9ng d\u1ecbch v\u1ee5 SSH<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu SSH kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng, m\u00e1y ch\u1ee7 s\u1ebd kh\u00f4ng th\u1ec3 ti\u1ebfp nh\u1eadn y\u00eau c\u1ea7u k\u1ebft n\u1ed1i th\u00f4ng qua d\u1ecbch v\u1ee5 t\u01b0\u01a1ng \u1ee9ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi \u0111\u00e3 truy c\u1eadp Console\/VNC ho\u1eb7c c\u00f2n phi\u00ean qu\u1ea3n tr\u1ecb h\u1ee3p l\u1ec7, h\u00e3y ki\u1ec3m tra d\u1ecbch v\u1ee5 SSH.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span style=\"text-decoration: underline\">\u0110\u1ed1i v\u1edbi Ubuntu\/Debian:<\/span><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo systemctl status ssh<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu d\u1ecbch v\u1ee5 \u0111ang ng\u1eebng, ch\u1ea1y:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo systemctl start ssh<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ki\u1ec3m tra l\u1ea1i:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo systemctl status ssh<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span style=\"text-decoration: underline\">\u0110\u1ed1i v\u1edbi AlmaLinux\/Rocky Linux:<\/span><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo systemctl status sshd<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu d\u1ecbch v\u1ee5 \u0111ang ng\u1eebng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo systemctl start sshd<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Khi tr\u1ea1ng th\u00e1i hi\u1ec3n th\u1ecb active (running), d\u1ecbch v\u1ee5 SSH \u0111\u00e3 ho\u1ea1t \u0111\u1ed9ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tuy nhi\u00ean, m\u1ed9t s\u1ed1 b\u1ea3n ph\u00e2n ph\u1ed1i c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u01a1 ch\u1ebf systemd socket activation. Khi \u0111\u00f3, c\u1ea7n ki\u1ec3m tra th\u00eam socket qu\u1ea3n l\u00fd k\u1ebft n\u1ed1i n\u1ebfu tr\u1ea1ng th\u00e1i d\u1ecbch v\u1ee5 ch\u01b0a ph\u1ea3n \u00e1nh \u0111\u1ea7y \u0111\u1ee7 kh\u1ea3 n\u0103ng l\u1eafng nghe c\u1ed5ng SSH.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-8-1024x549.png\" alt=\"Ki\u1ec3m tra v\u00e0 kh\u1edfi \u0111\u1ed9ng d\u1ecbch v\u1ee5 SSH\" class=\"wp-image-132520\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-8-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-8-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-8-767x411.png 767w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-8-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-8-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong><strong>Ki\u1ec3m tra v\u00e0 kh\u1edfi \u0111\u1ed9ng d\u1ecbch v\u1ee5 SSH<\/strong><\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Trong tr\u01b0\u1eddng h\u1ee3p Ubuntu\/Debian ch\u01b0a c\u00e0i OpenSSH Server, b\u1ea1n c\u00f3 th\u1ec3 c\u00e0i \u0111\u1eb7t b\u1eb1ng l\u1ec7nh:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt update\n\nsudo apt install openssh-server<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ec9 th\u1ef1c hi\u1ec7n thao t\u00e1c c\u00e0i \u0111\u1eb7t n\u1ebfu g\u00f3i th\u1ef1c s\u1ef1 ch\u01b0a c\u00f3 v\u00e0 m\u00e1y ch\u1ee7 c\u00f3 th\u1ec3 truy c\u1eadp ngu\u1ed3n ph\u1ea7n m\u1ec1m.<\/p>\n\n\n\n<h3 id=\"B\u01b0\u1edbc_3:_Ki\u1ec3m_tra_c\u1ea5u_h\u00ecnh_SSH_v\u00e0_c\u1ed5ng_k\u1ebft_n\u1ed1i\"><strong>B\u01b0\u1edbc 3: Ki\u1ec3m tra c\u1ea5u h\u00ecnh SSH v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">D\u1ecbch v\u1ee5 SSH c\u00f3 th\u1ec3 ch\u1ea1y b\u00ecnh th\u01b0\u1eddng nh\u01b0ng s\u1eed d\u1ee5ng c\u1ed5ng kh\u00e1c v\u1edbi th\u00f4ng tin \u0111\u01b0\u1ee3c nh\u1eadp tr\u00ean m\u00e1y t\u00ednh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean VPS Linux, ki\u1ec3m tra c\u1ea5u h\u00ecnh hi\u1ec7u l\u1ef1c c\u1ee7a OpenSSH b\u1eb1ng l\u1ec7nh:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo sshd -T<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Trong k\u1ebft qu\u1ea3, ch\u00fa \u00fd c\u00e1c thi\u1ebft l\u1eadp nh\u01b0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>port:<\/strong> C\u1ed5ng SSH \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh.<\/li>\n\n\n\n<li><strong>passwordauthentication:<\/strong> Ch\u00ednh s\u00e1ch x\u00e1c th\u1ef1c b\u1eb1ng m\u1eadt kh\u1ea9u.<\/li>\n\n\n\n<li><strong>pubkeyauthentication:<\/strong> Ch\u00ednh s\u00e1ch x\u00e1c th\u1ef1c b\u1eb1ng kh\u00f3a c\u00f4ng khai.<\/li>\n\n\n\n<li><strong>permitrootlogin:<\/strong> Ch\u00ednh s\u00e1ch cho ph\u00e9p \u0111\u0103ng nh\u1eadp b\u1eb1ng t\u00e0i kho\u1ea3n root.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ti\u1ebfp theo, ki\u1ec3m tra c\u00e1c c\u1ed5ng TCP \u0111ang \u0111\u01b0\u1ee3c l\u1eafng nghe:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ss -lntp<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00ecm c\u1ed5ng SSH trong k\u1ebft qu\u1ea3. N\u1ebfu s\u1eed d\u1ee5ng c\u1ed5ng m\u1eb7c \u0111\u1ecbnh, th\u00f4ng th\u01b0\u1eddng b\u1ea1n s\u1ebd th\u1ea5y c\u1ed5ng 22 \u1edf tr\u1ea1ng th\u00e1i LISTEN.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-9-1-1024x549.png\" alt=\"Ki\u1ec3m tra c\u1ea5u h\u00ecnh SSH v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i\" class=\"wp-image-132519\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-9-1-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-9-1-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-9-1-767x411.png 767w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-9-1-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-9-1-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra c\u1ea5u h\u00ecnh SSH v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">C\u1ea7n l\u01b0u \u00fd r\u1eb1ng tr\u00ean h\u1ec7 th\u1ed1ng s\u1eed d\u1ee5ng socket activation, c\u1ed5ng l\u1eafng nghe c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd b\u1edfi systemd. V\u00ec v\u1eady, kh\u00f4ng n\u00ean ch\u1ec9 d\u1ef1a v\u00e0o t\u00ean ti\u1ebfn tr\u00ecnh sshd \u0111\u1ec3 k\u1ebft lu\u1eadn d\u1ecbch v\u1ee5 kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu c\u1ea7n xem ho\u1eb7c ch\u1ec9nh s\u1eeda c\u1ea5u h\u00ecnh SSH tr\u00ean Ubuntu\/Debian, m\u1edf t\u1ec7p:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo nano \/etc\/ssh\/sshd_config<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i t\u1ec7p ch\u00ednh, h\u00e3y ki\u1ec3m tra c\u00e1c c\u1ea5u h\u00ecnh b\u1ed5 sung trong th\u01b0 m\u1ee5c:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/etc\/ssh\/sshd_config.d\/<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t s\u1ed1 thi\u1ebft l\u1eadp trong th\u01b0 m\u1ee5c b\u1ed5 sung c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u01b0u ti\u00ean h\u01a1n gi\u00e1 tr\u1ecb khai b\u00e1o \u1edf t\u1ec7p ch\u00ednh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1edbc khi \u00e1p d\u1ee5ng thay \u0111\u1ed5i, ki\u1ec3m tra c\u00fa ph\u00e1p:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo sshd -t<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu kh\u00f4ng c\u00f3 th\u00f4ng b\u00e1o l\u1ed7i, b\u1ea1n c\u00f3 th\u1ec3 ti\u1ebfp t\u1ee5c ki\u1ec3m tra c\u00e1ch \u00e1p d\u1ee5ng c\u1ea5u h\u00ecnh ph\u00f9 h\u1ee3p v\u1edbi d\u1ecbch v\u1ee5 SSH \u0111ang s\u1eed d\u1ee5ng. V\u1edbi h\u1ec7 th\u1ed1ng Ubuntu\/Debian d\u00f9ng ssh.service, l\u1ec7nh kh\u1edfi \u0111\u1ed9ng l\u1ea1i th\u01b0\u1eddng l\u00e0:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo systemctl restart ssh<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C\u1ea3nh b\u00e1o:<\/strong> Kh\u00f4ng n\u00ean thay \u0111\u1ed5i c\u1ed5ng SSH ho\u1eb7c kh\u1edfi \u0111\u1ed9ng l\u1ea1i d\u1ecbch v\u1ee5 khi ch\u01b0a c\u00f3 \u0111\u01b0\u1eddng truy c\u1eadp d\u1ef1 ph\u00f2ng. H\u00e3y gi\u1eef phi\u00ean SSH hi\u1ec7n t\u1ea1i, b\u1ea3o \u0111\u1ea3m t\u01b0\u1eddng l\u1eeda cho ph\u00e9p c\u1ed5ng m\u1edbi v\u00e0 th\u1eed \u0111\u0103ng nh\u1eadp b\u1eb1ng phi\u00ean th\u1ee9 hai tr\u01b0\u1edbc khi \u0111\u00f3ng phi\u00ean c\u0169.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-10-1024x549.png\" alt=\"Ki\u1ec3m tra c\u1ea5u h\u00ecnh SSH v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i\" class=\"wp-image-132521\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-10-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-10-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-10-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-10-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-10-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"> <strong>Ki\u1ec3m tra c\u1ea5u h\u00ecnh SSH v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<h3 id=\"B\u01b0\u1edbc_4:_Ki\u1ec3m_tra_t\u01b0\u1eddng_l\u1eeda_tr\u00ean_VPS\"><strong>B\u01b0\u1edbc 4: Ki\u1ec3m tra t\u01b0\u1eddng l\u1eeda tr\u00ean VPS<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">T\u01b0\u1eddng l\u1eeda c\u00f3 th\u1ec3 ch\u1eb7n c\u1ed5ng SSH d\u00f9 d\u1ecbch v\u1ee5 \u0111\u00e3 ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng.<\/p>\n\n\n\n<h4 id=\"Tr\u01b0\u1eddng_h\u1ee3p_s\u1eed_d\u1ee5ng_Ubuntu\/Debian_v\u1edbi_UFW\"><strong>Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng Ubuntu\/Debian v\u1edbi UFW<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ki\u1ec3m tra tr\u1ea1ng th\u00e1i t\u01b0\u1eddng l\u1eeda:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ufw status verbose<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu UFW \u0111ang ho\u1ea1t \u0111\u1ed9ng nh\u01b0ng ch\u01b0a cho ph\u00e9p c\u1ed5ng SSH m\u1eb7c \u0111\u1ecbnh, b\u1ea1n c\u00f3 th\u1ec3 b\u1ed5 sung quy t\u1eafc:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ufw allow 22\/tcp<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sau \u0111\u00f3 ki\u1ec3m tra:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ufw status<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu SSH s\u1eed d\u1ee5ng c\u1ed5ng t\u00f9y ch\u1ec9nh, c\u1ea7n m\u1edf \u0111\u00fang c\u1ed5ng \u0111\u00e3 c\u1ea5u h\u00ecnh thay v\u00ec m\u1eb7c \u0111\u1ecbnh m\u1edf c\u1ed5ng 22.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-11-1024x549.png\" alt=\" Ki\u1ec3m tra t\u01b0\u1eddng l\u1eeda tr\u00ean VPS\" class=\"wp-image-132522\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-11-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-11-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-11-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-11-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-11-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong> Ki\u1ec3m tra t\u01b0\u1eddng l\u1eeda tr\u00ean VPS<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<h4 id=\"Tr\u01b0\u1eddng_h\u1ee3p_s\u1eed_d\u1ee5ng_AlmaLinux\/Rocky_Linux_v\u1edbi_firewalld\"><strong>Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng AlmaLinux\/Rocky Linux v\u1edbi firewalld<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ki\u1ec3m tra tr\u1ea1ng th\u00e1i v\u00e0 c\u00e1c v\u00f9ng m\u1ea1ng \u0111ang ho\u1ea1t \u0111\u1ed9ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo firewall-cmd --state\n\nsudo firewall-cmd --get-active-zones<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ki\u1ec3m tra quy t\u1eafc c\u1ee7a v\u00f9ng m\u1ea1ng \u0111ang \u00e1p d\u1ee5ng cho VPS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu v\u00f9ng m\u1eb7c \u0111\u1ecbnh ch\u00ednh l\u00e0 v\u00f9ng c\u1ea7n c\u1ea5u h\u00ecnh v\u00e0 SSH s\u1eed d\u1ee5ng \u0111\u1ecbnh ngh\u0129a d\u1ecbch v\u1ee5 m\u1eb7c \u0111\u1ecbnh, b\u1ea1n c\u00f3 th\u1ec3 cho ph\u00e9p SSH:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo firewall-cmd --add-service=ssh<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Khi ki\u1ec3m tra truy c\u1eadp th\u00e0nh c\u00f4ng, l\u01b0u c\u00e1c thay \u0111\u1ed5i \u0111ang ho\u1ea1t \u0111\u1ed9ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo firewall-cmd --runtime-to-permanent<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu s\u1eed d\u1ee5ng v\u00f9ng m\u1ea1ng kh\u00e1c ho\u1eb7c c\u1ed5ng SSH t\u00f9y ch\u1ec9nh, c\u1ea7n \u0111i\u1ec1u ch\u1ec9nh quy t\u1eafc theo c\u1ea5u h\u00ecnh th\u1ef1c t\u1ebf.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i t\u01b0\u1eddng l\u1eeda trong h\u1ec7 \u0111i\u1ec1u h\u00e0nh, h\u00e3y ki\u1ec3m tra th\u00eam Firewall, Security Group ho\u1eb7c ACL tr\u00ean b\u1ea3ng qu\u1ea3n tr\u1ecb c\u1ee7a nh\u00e0 cung c\u1ea5p VPS n\u1ebfu c\u00f3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>L\u01b0u \u00fd b\u1ea3o m\u1eadt:<\/strong> Ch\u1ec9 m\u1edf c\u00e1c c\u1ed5ng th\u1ef1c s\u1ef1 c\u1ea7n thi\u1ebft. Khi c\u00f3 \u0111\u1ecba ch\u1ec9 IP qu\u1ea3n tr\u1ecb c\u1ed1 \u0111\u1ecbnh, n\u00ean gi\u1edbi h\u1ea1n quy\u1ec1n truy c\u1eadp SSH theo IP thay v\u00ec cho ph\u00e9p to\u00e0n b\u1ed9 Internet.<\/p>\n\n\n\n<h3 id=\"B\u01b0\u1edbc_5:_Ki\u1ec3m_tra_t\u00e0i_kho\u1ea3n_v\u00e0_SSH_Key\"><strong>B\u01b0\u1edbc 5: Ki\u1ec3m tra t\u00e0i kho\u1ea3n v\u00e0 SSH Key<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu nh\u1eadn th\u00f4ng b\u00e1o <strong>Permission denied<\/strong>, nguy\u00ean nh\u00e2n th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn qu\u00e1 tr\u00ecnh x\u00e1c th\u1ef1c thay v\u00ec \u0111\u01b0\u1eddng truy\u1ec1n m\u1ea1ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c tr\u01b0\u1eddng h\u1ee3p c\u1ea7n ki\u1ec3m tra g\u1ed3m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sai t\u00ean ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c m\u1eadt kh\u1ea9u.<\/li>\n\n\n\n<li>T\u00e0i kho\u1ea3n b\u1ecb kh\u00f3a ho\u1eb7c kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p \u0111\u0103ng nh\u1eadp SSH.<\/li>\n\n\n\n<li>S\u1eed d\u1ee5ng SSH Key kh\u00f4ng kh\u1edbp v\u1edbi kh\u00f3a c\u00f4ng khai tr\u00ean VPS.<\/li>\n\n\n\n<li>Quy\u1ec1n truy c\u1eadp c\u00e1c t\u1ec7p SSH kh\u00f4ng ch\u00ednh x\u00e1c.<\/li>\n\n\n\n<li>M\u00e1y ch\u1ee7 kh\u00f4ng cho ph\u00e9p ph\u01b0\u01a1ng th\u1ee9c x\u00e1c th\u1ef1c \u0111ang s\u1eed d\u1ee5ng.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu \u0111\u0103ng nh\u1eadp b\u1eb1ng SSH Key, h\u00e3y ki\u1ec3m tra t\u1ec7p private key \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng tr\u00ean m\u00e1y t\u00ednh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5 v\u1edbi OpenSSH:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ssh -i ~\/.ssh\/id_ed25519 -p 22 username@DIA_CHI_IP<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Thay \u0111\u01b0\u1eddng d\u1eabn kh\u00f3a, t\u00ean ng\u01b0\u1eddi d\u00f9ng v\u00e0 IP theo m\u00f4i tr\u01b0\u1eddng th\u1ef1c t\u1ebf.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean VPS Linux, kh\u00f3a c\u00f4ng khai \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn th\u01b0\u1eddng n\u1eb1m trong t\u1ec7p:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>~\/.ssh\/authorized_keys<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u01b0\u1eddng d\u1eabn tr\u00ean thu\u1ed9c th\u01b0 m\u1ee5c c\u00e1 nh\u00e2n c\u1ee7a t\u00e0i kho\u1ea3n mu\u1ed1n \u0111\u0103ng nh\u1eadp, kh\u00f4ng nh\u1ea5t thi\u1ebft l\u00e0 th\u01b0 m\u1ee5c c\u1ee7a root.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-12-1024x549.png\" alt=\"Ki\u1ec3m tra c\u1ea5u h\u00ecnh SSH v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i\" class=\"wp-image-132523\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-12-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-12-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-12-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-12-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-12-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra c\u1ea5u h\u00ecnh SSH v\u00e0 c\u1ed5ng k\u1ebft n\u1ed1i<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">B\u1ea1n c\u0169ng n\u00ean ki\u1ec3m tra quy\u1ec1n s\u1edf h\u1eefu v\u00e0 quy\u1ec1n truy c\u1eadp th\u01b0 m\u1ee5c <strong>.ssh<\/strong>, t\u1ec7p <strong>authorized_keys<\/strong> v\u00e0 th\u01b0 m\u1ee5c home c\u1ee7a t\u00e0i kho\u1ea3n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u00f4ng n\u00ean b\u1eadt \u0111\u0103ng nh\u1eadp root ho\u1eb7c x\u00e1c th\u1ef1c m\u1eadt kh\u1ea9u ch\u1ec9 \u0111\u1ec3 x\u1eed l\u00fd nhanh khi ch\u01b0a \u0111\u00e1nh gi\u00e1 y\u00eau c\u1ea7u b\u1ea3o m\u1eadt c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n\n\n\n<h3 id=\"B\u01b0\u1edbc_6:_Ki\u1ec3m_tra_nh\u1eadt_k\u00fd_h\u1ec7_th\u1ed1ng_v\u00e0_t\u00e0i_nguy\u00ean_VPS\"><strong>B\u01b0\u1edbc 6: Ki\u1ec3m tra nh\u1eadt k\u00fd h\u1ec7 th\u1ed1ng v\u00e0 t\u00e0i nguy\u00ean VPS<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu \u0111\u00e3 ki\u1ec3m tra c\u1ea5u h\u00ecnh, d\u1ecbch v\u1ee5 v\u00e0 t\u01b0\u1eddng l\u1eeda nh\u01b0ng v\u1eabn kh\u00f4ng th\u1ec3 \u0111\u0103ng nh\u1eadp, h\u00e3y xem nh\u1eadt k\u00fd h\u1ec7 th\u1ed1ng \u0111\u1ec3 t\u00ecm nguy\u00ean nh\u00e2n c\u1ee5 th\u1ec3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Tr\u00ean Ubuntu\/Debian<\/strong>, ki\u1ec3m tra nh\u1eadt k\u00fd SSH:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo journalctl -u ssh -n 50 --no-pager<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Tr\u00ean AlmaLinux\/Rocky Linux<\/strong>, s\u1eed d\u1ee5ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo journalctl -u sshd -n 50 --no-pager<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Nh\u1eadt k\u00fd c\u00f3 th\u1ec3 cho bi\u1ebft nguy\u00ean nh\u00e2n nh\u01b0:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>X\u00e1c th\u1ef1c th\u1ea5t b\u1ea1i.<\/li>\n\n\n\n<li>T\u00e0i kho\u1ea3n \u0111\u0103ng nh\u1eadp kh\u00f4ng h\u1ee3p l\u1ec7.<\/li>\n\n\n\n<li>C\u1ea5u h\u00ecnh SSH b\u1ecb l\u1ed7i.<\/li>\n\n\n\n<li>D\u1ecbch v\u1ee5 kh\u00f4ng th\u1ec3 kh\u1edfi \u0111\u1ed9ng ho\u1eb7c g\u1eb7p v\u1ea5n \u0111\u1ec1 khi x\u1eed l\u00fd k\u1ebft n\u1ed1i.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i ra, h\u00e3y ki\u1ec3m tra m\u1ee9c s\u1eed d\u1ee5ng t\u00e0i nguy\u00ean.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-13-1024x549.png\" alt=\"Ki\u1ec3m tra nh\u1eadt k\u00fd h\u1ec7 th\u1ed1ng v\u00e0 t\u00e0i nguy\u00ean VPS\" class=\"wp-image-132524\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-13-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-13-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-13-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-13-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-13-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra nh\u1eadt k\u00fd h\u1ec7 th\u1ed1ng v\u00e0 t\u00e0i nguy\u00ean VPS<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Ki\u1ec3m tra dung l\u01b0\u1ee3ng \u1ed5 \u0111\u0129a:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>df -h<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ki\u1ec3m tra RAM:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>free -h<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Theo d\u00f5i ti\u1ebfn tr\u00ecnh v\u00e0 t\u00e0i nguy\u00ean h\u1ec7 th\u1ed1ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>top<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu ph\u00e2n v\u00f9ng h\u1ec7 th\u1ed1ng \u0111\u00e3 \u0111\u1ea7y ho\u1eb7c m\u00e1y ch\u1ee7 li\u00ean t\u1ee5c thi\u1ebfu b\u1ed9 nh\u1edb, b\u1ea1n c\u1ea7n x\u00e1c \u0111\u1ecbnh nguy\u00ean nh\u00e2n tr\u01b0\u1edbc khi d\u1ecdn d\u1eb9p d\u1eef li\u1ec7u ho\u1eb7c kh\u1edfi \u0111\u1ed9ng l\u1ea1i d\u1ecbch v\u1ee5.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1eddng h\u1ee3p nghi ng\u1edd \u0111\u1ecba ch\u1ec9 IP b\u1ecb Fail2ban ch\u1eb7n, c\u00f3 th\u1ec3 ki\u1ec3m tra b\u1eb1ng l\u1ec7nh sau n\u1ebfu jail SSH \u0111\u01b0\u1ee3c \u0111\u1eb7t t\u00ean l\u00e0 sshd:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo fail2ban-client status sshd<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu ph\u00e1t hi\u1ec7n IP qu\u1ea3n tr\u1ecb trong danh s\u00e1ch b\u1ecb ch\u1eb7n, h\u00e3y x\u00e1c minh nguy\u00ean nh\u00e2n v\u00e0 ch\u1ec9 g\u1ee1 ch\u1eb7n \u0111\u1ecba ch\u1ec9 h\u1ee3p l\u1ec7.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-14-1024x549.png\" alt=\"Ki\u1ec3m tra nh\u1eadt k\u00fd h\u1ec7 th\u1ed1ng v\u00e0 t\u00e0i nguy\u00ean VPS\" class=\"wp-image-132525\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-14-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-14-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-14-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-14-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-14-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra nh\u1eadt k\u00fd h\u1ec7 th\u1ed1ng v\u00e0 t\u00e0i nguy\u00ean VPS<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<h2 id=\"H\u01b0\u1edbng_d\u1eabn_s\u1eeda_l\u1ed7i_kh\u00f4ng_v\u00e0o_\u0111\u01b0\u1ee3c_VPS_Windows_qua_Remote_Desktop\"><strong>H\u01b0\u1edbng d\u1eabn s\u1eeda l\u1ed7i kh\u00f4ng v\u00e0o \u0111\u01b0\u1ee3c VPS Windows qua Remote Desktop<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed1i v\u1edbi VPS Windows, ph\u01b0\u01a1ng th\u1ee9c qu\u1ea3n tr\u1ecb ph\u1ed5 bi\u1ebfn l\u00e0 Remote Desktop Protocol (RDP). N\u1ebfu kh\u00f4ng th\u1ec3 truy c\u1eadp b\u1eb1ng Remote Desktop Connection, b\u1ea1n n\u00ean ki\u1ec3m tra IP, c\u1ed5ng k\u1ebft n\u1ed1i, tr\u1ea1ng th\u00e1i d\u1ecbch v\u1ee5 v\u00e0 quy\u1ec1n \u0111\u0103ng nh\u1eadp.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">H\u01b0\u1edbng d\u1eabn d\u01b0\u1edbi \u0111\u00e2y \u00e1p d\u1ee5ng cho VPS ch\u1ea1y Windows Server c\u00f3 h\u1ed7 tr\u1ee3 Remote Desktop.<\/p>\n\n\n\n<h3 id=\"B\u01b0\u1edbc_1:_Ki\u1ec3m_tra_\u0111\u1ecba_ch\u1ec9_IP_v\u00e0_th\u00f4ng_tin_Remote_Desktop\"><strong>B\u01b0\u1edbc 1: Ki\u1ec3m tra \u0111\u1ecba ch\u1ec9 IP v\u00e0 th\u00f4ng tin Remote Desktop<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean m\u00e1y t\u00ednh Windows c\u1ee7a b\u1ea1n:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Nh\u1ea5n t\u1ed5 h\u1ee3p ph\u00edm <strong>Windows + R<\/strong>.<\/li>\n\n\n\n<li>Nh\u1eadp <strong>mstsc<\/strong> v\u00e0 nh\u1ea5n <strong>Enter<\/strong>.<\/li>\n\n\n\n<li>Trong c\u1eeda s\u1ed5 Remote Desktop Connection, nh\u1eadp \u0111\u1ecba ch\u1ec9 IP c\u1ee7a VPS.<\/li>\n\n\n\n<li>Nh\u1ea5n <strong>Connect<\/strong>.<\/li>\n\n\n\n<li>Nh\u1eadp t\u00e0i kho\u1ea3n v\u00e0 m\u1eadt kh\u1ea9u \u0111\u01b0\u1ee3c c\u1ea5p.<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-15-1024x549.png\" alt=\"Ki\u1ec3m tra \u0111\u1ecba ch\u1ec9 IP v\u00e0 th\u00f4ng tin Remote Desktop\" class=\"wp-image-132526\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-15-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-15-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-15-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-15-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-15-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra \u0111\u1ecba ch\u1ec9 IP v\u00e0 th\u00f4ng tin Remote Desktop<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu m\u00e1y ch\u1ee7 s\u1eed d\u1ee5ng c\u1ed5ng RDP t\u00f9y ch\u1ec9nh, h\u00e3y nh\u1eadp theo c\u00fa ph\u00e1p:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>DIA_CHI_IP:3390<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Trong v\u00ed d\u1ee5 n\u00e0y, 3390 l\u00e0 c\u1ed5ng t\u00f9y ch\u1ec9nh minh h\u1ecda. B\u1ea1n ph\u1ea3i s\u1eed d\u1ee5ng \u0111\u00fang c\u1ed5ng \u0111\u00e3 thi\u1ebft l\u1eadp tr\u00ean VPS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu k\u1ebft n\u1ed1i th\u1ea5t b\u1ea1i, ti\u1ebfp t\u1ee5c ki\u1ec3m tra kh\u1ea3 n\u0103ng truy c\u1eadp c\u1ed5ng RDP.<\/p>\n\n\n\n<h3 id=\"B\u01b0\u1edbc_2:_Ki\u1ec3m_tra_c\u1ed5ng_k\u1ebft_n\u1ed1i_RDP\"><strong>B\u01b0\u1edbc 2: Ki\u1ec3m tra c\u1ed5ng k\u1ebft n\u1ed1i RDP<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1edf Windows PowerShell tr\u00ean m\u00e1y t\u00ednh c\u00e1 nh\u00e2n v\u00e0 ch\u1ea1y:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Test-NetConnection DIA_CHI_IP -Port 3389<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu TcpTestSucceeded hi\u1ec3n th\u1ecb <strong>False<\/strong>, h\u00e3y ki\u1ec3m tra quy t\u1eafc m\u1ea1ng v\u00e0 tr\u1ea1ng th\u00e1i Remote Desktop tr\u00ean VPS.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-16-1024x549.png\" alt=\"Ki\u1ec3m tra c\u1ed5ng k\u1ebft n\u1ed1i RDP\" class=\"wp-image-132527\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-16-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-16-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-16-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-16-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-16-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra c\u1ed5ng k\u1ebft n\u1ed1i RDP<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Khi c\u00f3 quy\u1ec1n truy c\u1eadp Console c\u1ee7a Windows Server, b\u1ea1n c\u00f3 th\u1ec3 ki\u1ec3m tra c\u1ed5ng RDP \u0111\u01b0\u1ee3c c\u1ea5u h\u00ecnh b\u1eb1ng PowerShell:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Get-ItemProperty -Path 'HKLM:\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\WinStations\\RDP-Tcp' -Name PortNumber<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Th\u00f4ng th\u01b0\u1eddng, gi\u00e1 tr\u1ecb PortNumber l\u00e0 <strong>3389<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu c\u1ed5ng \u0111\u00e3 \u0111\u01b0\u1ee3c thay \u0111\u1ed5i, c\u1ea7n s\u1eed d\u1ee5ng c\u1ed5ng t\u01b0\u01a1ng \u1ee9ng trong \u1ee9ng d\u1ee5ng Remote Desktop Connection v\u00e0 b\u1ea3o \u0111\u1ea3m t\u01b0\u1eddng l\u1eeda cho ph\u00e9p k\u1ebft n\u1ed1i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u00f4ng n\u00ean ch\u1ec9nh s\u1eeda Registry khi ch\u01b0a sao l\u01b0u c\u1ea5u h\u00ecnh v\u00e0 x\u00e1c \u0111\u1ecbnh r\u00f5 nguy\u00ean nh\u00e2n.<\/p>\n\n\n\n<h3 id=\"B\u01b0\u1edbc_3:_Ki\u1ec3m_tra_d\u1ecbch_v\u1ee5_Remote_Desktop\"><strong>B\u01b0\u1edbc 3: Ki\u1ec3m tra d\u1ecbch v\u1ee5 Remote Desktop<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu RDP kh\u00f4ng ti\u1ebfp nh\u1eadn k\u1ebft n\u1ed1i, h\u00e3y ki\u1ec3m tra tr\u1ea1ng th\u00e1i d\u1ecbch v\u1ee5 tr\u00ean Windows Server.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Truy c\u1eadp m\u00e1y ch\u1ee7 th\u00f4ng qua Console c\u1ee7a nh\u00e0 cung c\u1ea5p VPS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sau \u0111\u00f3, m\u1edf PowerShell v\u1edbi quy\u1ec1n Administrator v\u00e0 th\u1ef1c hi\u1ec7n:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Get-Service -Name TermService<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u00e2y l\u00e0 d\u1ecbch v\u1ee5 <strong>Remote Desktop Services<\/strong> c\u1ee7a Windows.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-17-1024x549.png\" alt=\"Ki\u1ec3m tra d\u1ecbch v\u1ee5 Remote Desktop\" class=\"wp-image-132528\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-17-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-17-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-17-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-17-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-17-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra d\u1ecbch v\u1ee5 Remote Desktop<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu d\u1ecbch v\u1ee5 \u0111ang d\u1eebng, b\u1ea1n c\u00f3 th\u1ec3 th\u1eed kh\u1edfi \u0111\u1ed9ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Start-Service -Name TermService<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Ti\u1ebfp theo, ki\u1ec3m tra l\u1ea1i:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Get-Service -Name TermService<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu d\u1ecbch v\u1ee5 \u0111\u00e3 ch\u1ea1y nh\u01b0ng ch\u01b0a th\u1ec3 k\u1ebft n\u1ed1i, h\u00e3y ki\u1ec3m tra t\u00ednh n\u0103ng Remote Desktop c\u00f3 \u0111\u01b0\u1ee3c cho ph\u00e9p hay kh\u00f4ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean Windows Server, b\u1ea1n c\u00f3 th\u1ec3 m\u1edf sysdm.cpl, chuy\u1ec3n \u0111\u1ebfn th\u1ebb <strong>Remote<\/strong> \u0111\u1ec3 xem thi\u1ebft l\u1eadp cho ph\u00e9p k\u1ebft n\u1ed1i t\u1eeb xa. Giao di\u1ec7n c\u00f3 th\u1ec3 kh\u00e1c nhau t\u00f9y phi\u00ean b\u1ea3n v\u00e0 ch\u00ednh s\u00e1ch qu\u1ea3n tr\u1ecb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i ra, h\u00e3y ki\u1ec3m tra \u1ee9ng d\u1ee5ng ho\u1eb7c d\u1ecbch v\u1ee5 c\u00f3 \u0111ang l\u1eafng nghe t\u1ea1i c\u1ed5ng RDP th\u1ef1c t\u1ebf hay kh\u00f4ng:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Get-NetTCPConnection -LocalPort 3389 -State Listen<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ec7nh tr\u00ean gi\u1ea3 \u0111\u1ecbnh m\u00e1y ch\u1ee7 s\u1eed d\u1ee5ng c\u1ed5ng m\u1eb7c \u0111\u1ecbnh 3389.<\/p>\n\n\n\n<h3 id=\"B\u01b0\u1edbc_4:_Ki\u1ec3m_tra_Windows_Firewall_v\u00e0_quy\u1ec1n_\u0111\u0103ng_nh\u1eadp\"><strong>B\u01b0\u1edbc 4: Ki\u1ec3m tra Windows Firewall v\u00e0 quy\u1ec1n \u0111\u0103ng nh\u1eadp<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Windows Firewall c\u00f3 th\u1ec3 ch\u1eb7n c\u00e1c y\u00eau c\u1ea7u Remote Desktop t\u1eeb b\u00ean ngo\u00e0i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean Windows Server, m\u1edf PowerShell b\u1eb1ng quy\u1ec1n Administrator v\u00e0 ki\u1ec3m tra nh\u00f3m quy t\u1eafc:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Get-NetFirewallRule -DisplayGroup \"Remote Desktop\"<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu c\u00e1c quy t\u1eafc c\u1ea7n thi\u1ebft \u0111ang b\u1ecb v\u00f4 hi\u1ec7u h\u00f3a, b\u1ea1n c\u00f3 th\u1ec3 b\u1eadt l\u1ea1i b\u1eb1ng l\u1ec7nh:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Get-NetFirewallRule -DisplayGroup \"Remote Desktop\" | Set-NetFirewallRule -Enabled True<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00ean nh\u00f3m hi\u1ec3n th\u1ecb c\u00f3 th\u1ec3 thay \u0111\u1ed5i theo ng\u00f4n ng\u1eef c\u1ee7a Windows. N\u1ebfu kh\u00f4ng t\u00ecm th\u1ea5y nh\u00f3m, h\u00e3y ki\u1ec3m tra tr\u1ef1c ti\u1ebfp trong <strong>Windows Defender Firewall with Advanced Security<\/strong> b\u1eb1ng l\u1ec7nh wf.msc.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-18-1024x549.png\" alt=\"Ki\u1ec3m tra Windows Firewall v\u00e0 quy\u1ec1n \u0111\u0103ng nh\u1eadp\" class=\"wp-image-132529\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-18-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-18-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-18-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-18-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-18-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra Windows Firewall v\u00e0 quy\u1ec1n \u0111\u0103ng nh\u1eadp<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Sau khi \u0111i\u1ec1u ch\u1ec9nh, ki\u1ec3m tra l\u1ea1i k\u1ebft n\u1ed1i RDP t\u1eeb m\u00e1y t\u00ednh c\u00e1 nh\u00e2n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu c\u1ed5ng \u0111\u00e3 th\u00f4ng nh\u01b0ng kh\u00f4ng \u0111\u0103ng nh\u1eadp \u0111\u01b0\u1ee3c, c\u1ea7n ki\u1ec3m tra th\u00eam:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>T\u00ean ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u1eadt kh\u1ea9u Windows.<\/li>\n\n\n\n<li>T\u00e0i kho\u1ea3n c\u00f3 b\u1ecb kh\u00f3a ho\u1eb7c h\u1ebft h\u1ea1n m\u1eadt kh\u1ea9u hay kh\u00f4ng.<\/li>\n\n\n\n<li>T\u00e0i kho\u1ea3n c\u00f3 quy\u1ec1n \u0111\u0103ng nh\u1eadp qua Remote Desktop hay kh\u00f4ng.<\/li>\n\n\n\n<li>Ch\u00ednh s\u00e1ch Network Level Authentication (NLA).<\/li>\n\n\n\n<li>Quy t\u1eafc Firewall ho\u1eb7c Security Group ph\u00eda nh\u00e0 cung c\u1ea5p.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-19-1024x549.png\" alt=\"Ki\u1ec3m tra Windows Firewall v\u00e0 quy\u1ec1n \u0111\u0103ng nh\u1eadp\" class=\"wp-image-132530\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-19-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-19-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-19-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-19-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-19-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>Ki\u1ec3m tra Windows Firewall v\u00e0 quy\u1ec1n \u0111\u0103ng nh\u1eadp<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\"><strong>Khuy\u1ebfn ngh\u1ecb:<\/strong> Kh\u00f4ng n\u00ean t\u1eaft to\u00e0n b\u1ed9 Windows Firewall \u0111\u1ec3 x\u1eed l\u00fd l\u1ed7i. N\u1ebfu VPS c\u00f3 IP c\u00f4ng khai, h\u00e3y \u01b0u ti\u00ean gi\u1edbi h\u1ea1n truy c\u1eadp RDP theo IP qu\u1ea3n tr\u1ecb ho\u1eb7c k\u1ebft n\u1ed1i qua VPN thay v\u00ec m\u1edf tr\u1ef1c ti\u1ebfp cho to\u00e0n b\u1ed9 Internet.<\/p>\n\n\n\n<h2 id=\"L\u00e0m_g\u00ec_khi_m\u1ea5t_ho\u00e0n_to\u00e0n_quy\u1ec1n_truy_c\u1eadp_VPS?\"><strong>L\u00e0m g\u00ec khi m\u1ea5t ho\u00e0n to\u00e0n quy\u1ec1n truy c\u1eadp VPS?<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu kh\u00f4ng th\u1ec3 \u0111\u0103ng nh\u1eadp b\u1eb1ng SSH ho\u1eb7c Remote Desktop, <strong>Console\/VNC do nh\u00e0 cung c\u1ea5p VPS cung c\u1ea5p<\/strong> th\u01b0\u1eddng l\u00e0 ph\u01b0\u01a1ng \u00e1n kh\u00f4i ph\u1ee5c c\u1ea7n \u01b0u ti\u00ean.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00f4ng c\u1ee5 Console cho ph\u00e9p t\u01b0\u01a1ng t\u00e1c v\u1edbi m\u00e0n h\u00ecnh ho\u1eb7c c\u1ed5ng \u0111i\u1ec1u khi\u1ec3n c\u1ee7a m\u00e1y \u1ea3o m\u00e0 kh\u00f4ng c\u1ea7n s\u1eed d\u1ee5ng d\u1ecbch v\u1ee5 SSH\/RDP b\u00ean trong h\u1ec7 \u0111i\u1ec1u h\u00e0nh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ph\u1ea7n n\u00e0y s\u1eed d\u1ee5ng<a href=\"https:\/\/tino.vn\/vps-gia-re\" target=\"_blank\" data-type=\"link\" data-id=\"https:\/\/tino.vn\/vps-gia-re\" rel=\"noreferrer noopener\"> VPS Tino<\/a> l\u00e0m v\u00ed d\u1ee5. B\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n theo tr\u00ecnh t\u1ef1 sau:<\/p>\n\n\n\n<h3 id=\"B\u01b0\u1edbc_1:_\u0110\u0103ng_nh\u1eadp_trang_qu\u1ea3n_tr\u1ecb_VPS\"><strong>B\u01b0\u1edbc 1: \u0110\u0103ng nh\u1eadp trang qu\u1ea3n tr\u1ecb VPS<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Truy c\u1eadp t\u00e0i kho\u1ea3n t\u1ea1i nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5, ch\u1ecdn VPS \u0111ang g\u1eb7p s\u1ef1 c\u1ed1 v\u00e0 ki\u1ec3m tra tr\u1ea1ng th\u00e1i ho\u1ea1t \u0111\u1ed9ng.<\/p>\n\n\n\n<h3 id=\"B\u01b0\u1edbc_2:_M\u1edf_Console_ho\u1eb7c_VNC\"><strong>B\u01b0\u1edbc 2: M\u1edf Console ho\u1eb7c VNC<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00ecm ch\u1ee9c n\u0103ng c\u00f3 t\u00ean Console, VNC, Web Console ho\u1eb7c Serial Console t\u00f9y n\u1ec1n t\u1ea3ng qu\u1ea3n tr\u1ecb.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-20-1024x549.png\" alt=\"M\u1edf Console ho\u1eb7c VNC\" class=\"wp-image-132531\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-20-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-20-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-20-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-20-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-20-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><strong>M\u1edf Console ho\u1eb7c VNC<\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu nh\u00e0 cung c\u1ea5p h\u1ed7 tr\u1ee3, m\u1edf phi\u00ean truy c\u1eadp tr\u1ef1c ti\u1ebfp v\u00e0o h\u1ec7 \u0111i\u1ec1u h\u00e0nh.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-21-1024x549.png\" alt=\"\" class=\"wp-image-132532\" title=\"\" srcset=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-21-1024x549.png 1024w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-21-300x161.png 300w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-21-768x411.png 768w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-21-1536x823.png 1536w, https:\/\/tino.vn\/blog\/wp-content\/uploads\/2026\/10\/sua-loi-khong-vao-duoc-vps-21-2048x1097.png 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<h3 id=\"B\u01b0\u1edbc_3:_Ki\u1ec3m_tra_c\u1ea5u_h\u00ecnh_g\u00e2y_m\u1ea5t_k\u1ebft_n\u1ed1i\"><strong>B\u01b0\u1edbc 3: Ki\u1ec3m tra c\u1ea5u h\u00ecnh g\u00e2y m\u1ea5t k\u1ebft n\u1ed1i<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00f9y theo h\u1ec7 \u0111i\u1ec1u h\u00e0nh, h\u00e3y ki\u1ec3m tra:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tr\u1ea1ng th\u00e1i d\u1ecbch v\u1ee5 SSH ho\u1eb7c RDP.<\/li>\n\n\n\n<li>Quy t\u1eafc t\u01b0\u1eddng l\u1eeda m\u1edbi thay \u0111\u1ed5i.<\/li>\n\n\n\n<li>\u0110\u1ecba ch\u1ec9 IP v\u00e0 c\u1ea5u h\u00ecnh m\u1ea1ng.<\/li>\n\n\n\n<li>Nh\u1eefng thi\u1ebft l\u1eadp VPN ho\u1eb7c \u0111\u1ecbnh tuy\u1ebfn v\u1eeba \u0111\u01b0\u1ee3c th\u00eam.<\/li>\n\n\n\n<li>T\u00ecnh tr\u1ea1ng b\u1ed9 nh\u1edb, \u1ed5 \u0111\u0129a v\u00e0 nh\u1eadt k\u00fd h\u1ec7 th\u1ed1ng.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu s\u1ef1 c\u1ed1 x\u1ea3y ra ngay sau khi thay \u0111\u1ed5i c\u1ea5u h\u00ecnh, h\u00e3y \u01b0u ti\u00ean ki\u1ec3m tra v\u00e0 ho\u00e0n t\u00e1c ch\u00ednh x\u00e1c thay \u0111\u1ed5i \u0111\u00f3.<\/p>\n\n\n\n<h3 id=\"B\u01b0\u1edbc_4:_Kh\u00f4i_ph\u1ee5c_k\u1ebft_n\u1ed1i_v\u00e0_ki\u1ec3m_tra_l\u1ea1i\"><strong>B\u01b0\u1edbc 4: Kh\u00f4i ph\u1ee5c k\u1ebft n\u1ed1i v\u00e0 ki\u1ec3m tra l\u1ea1i<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sau khi \u0111i\u1ec1u ch\u1ec9nh, th\u1eed \u0111\u0103ng nh\u1eadp t\u1eeb m\u1ed9t phi\u00ean k\u1ebft n\u1ed1i m\u1edbi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ec9 \u0111\u00f3ng phi\u00ean Console khi \u0111\u00e3 x\u00e1c nh\u1eadn c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i \u1ed5n \u0111\u1ecbnh b\u1eb1ng SSH ho\u1eb7c RDP.<\/p>\n\n\n\n<h3 id=\"B\u01b0\u1edbc_5:_Li\u00ean_h\u1ec7_nh\u00e0_cung_c\u1ea5p_n\u1ebfu_Console_c\u0169ng_kh\u00f4ng_ho\u1ea1t_\u0111\u1ed9ng\"><strong>B\u01b0\u1edbc 5: Li\u00ean h\u1ec7 nh\u00e0 cung c\u1ea5p n\u1ebfu Console c\u0169ng kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu VPS kh\u00f4ng kh\u1edfi \u0111\u1ed9ng ho\u1eb7c Console kh\u00f4ng th\u1ec3 truy c\u1eadp, b\u1ea1n n\u00ean g\u1eedi y\u00eau c\u1ea7u h\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi li\u00ean h\u1ec7, h\u00e3y cung c\u1ea5p m\u00e3 VPS, th\u1eddi \u0111i\u1ec3m x\u1ea3y ra s\u1ef1 c\u1ed1, th\u00f4ng b\u00e1o l\u1ed7i v\u00e0 nh\u1eefng thay \u0111\u1ed5i c\u1ea5u h\u00ecnh g\u1ea7n nh\u1ea5t. Tuy\u1ec7t \u0111\u1ed1i kh\u00f4ng g\u1eedi private key ho\u1eb7c m\u1eadt kh\u1ea9u trong n\u1ed9i dung h\u1ed7 tr\u1ee3 kh\u00f4ng \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1eb7c bi\u1ec7t, kh\u00f4ng n\u00ean t\u1ef1 \u00fd Rebuild ho\u1eb7c c\u00e0i l\u1ea1i h\u1ec7 \u0111i\u1ec1u h\u00e0nh khi ch\u01b0a sao l\u01b0u d\u1eef li\u1ec7u. Nh\u1eefng thao t\u00e1c n\u00e0y c\u00f3 th\u1ec3 khi\u1ebfn d\u1eef li\u1ec7u tr\u00ean \u1ed5 \u0111\u0129a h\u1ec7 th\u1ed1ng b\u1ecb x\u00f3a, t\u00f9y ch\u00ednh s\u00e1ch v\u00e0 ph\u01b0\u01a1ng th\u1ee9c tri\u1ec3n khai c\u1ee7a nh\u00e0 cung c\u1ea5p.<\/p>\n\n\n\n<h2 id=\"Nh\u1eefng_l\u01b0u_\u00fd_\u0111\u1ec3_h\u1ea1n_ch\u1ebf_l\u1ed7i_kh\u00f4ng_truy_c\u1eadp_\u0111\u01b0\u1ee3c_VPS\"><strong>Nh\u1eefng l\u01b0u \u00fd \u0111\u1ec3 h\u1ea1n ch\u1ebf l\u1ed7i kh\u00f4ng truy c\u1eadp \u0111\u01b0\u1ee3c VPS<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 gi\u1ea3m nguy c\u01a1 m\u1ea5t quy\u1ec1n truy c\u1eadp VPS trong qu\u00e1 tr\u00ecnh qu\u1ea3n tr\u1ecb, b\u1ea1n n\u00ean \u00e1p d\u1ee5ng m\u1ed9t s\u1ed1 nguy\u00ean t\u1eafc sau:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Lu\u00f4n c\u00f3 ph\u01b0\u01a1ng \u00e1n truy c\u1eadp d\u1ef1 ph\u00f2ng:<\/strong> Ki\u1ec3m tra quy\u1ec1n s\u1eed d\u1ee5ng Console\/VNC ngay khi nh\u1eadn VPS.<\/li>\n\n\n\n<li><strong>Sao l\u01b0u tr\u01b0\u1edbc khi thay \u0111\u1ed5i c\u1ea5u h\u00ecnh:<\/strong> \u0110\u1eb7c bi\u1ec7t v\u1edbi SSH, t\u01b0\u1eddng l\u1eeda, \u0111\u1ecbnh tuy\u1ebfn v\u00e0 thi\u1ebft l\u1eadp m\u1ea1ng.<\/li>\n\n\n\n<li><strong>Kh\u00f4ng \u0111\u00f3ng phi\u00ean SSH hi\u1ec7n t\u1ea1i qu\u00e1 s\u1edbm:<\/strong> Sau khi thay \u0111\u1ed5i c\u1ea5u h\u00ecnh, h\u00e3y \u0111\u0103ng nh\u1eadp th\u1eed b\u1eb1ng phi\u00ean m\u1edbi tr\u01b0\u1edbc.<\/li>\n\n\n\n<li><strong>Ki\u1ec3m tra c\u1ed5ng k\u1ebft n\u1ed1i tr\u01b0\u1edbc khi b\u1eadt t\u01b0\u1eddng l\u1eeda:<\/strong> \u0110\u1ea3m b\u1ea3o SSH ho\u1eb7c RDP v\u1eabn \u0111\u01b0\u1ee3c cho ph\u00e9p.<\/li>\n\n\n\n<li><strong>S\u1eed d\u1ee5ng x\u00e1c th\u1ef1c an to\u00e0n:<\/strong> \u01afu ti\u00ean SSH Key cho Linux, m\u1eadt kh\u1ea9u m\u1ea1nh v\u00e0 c\u01a1 ch\u1ebf b\u1ea3o v\u1ec7 ph\u00f9 h\u1ee3p cho Windows.<\/li>\n\n\n\n<li><strong>Gi\u1edbi h\u1ea1n quy\u1ec1n truy c\u1eadp qu\u1ea3n tr\u1ecb:<\/strong> \u01afu ti\u00ean IP tin c\u1eady, VPN ho\u1eb7c gi\u1ea3i ph\u00e1p ki\u1ec3m so\u00e1t truy c\u1eadp thay v\u00ec c\u00f4ng khai c\u1ed5ng qu\u1ea3n tr\u1ecb kh\u00f4ng c\u1ea7n thi\u1ebft.<\/li>\n\n\n\n<li><strong>Theo d\u00f5i t\u00e0i nguy\u00ean VPS:<\/strong> Ki\u1ec3m tra CPU, RAM v\u00e0 dung l\u01b0\u1ee3ng \u1ed5 \u0111\u0129a \u0111\u1ecbnh k\u1ef3 \u0111\u1ec3 ph\u00e1t hi\u1ec7n s\u1ef1 c\u1ed1 s\u1edbm.<\/li>\n\n\n\n<li><strong>Ghi l\u1ea1i nh\u1eefng thay \u0111\u1ed5i quan tr\u1ecdng:<\/strong> \u0110\u1eb7c bi\u1ec7t l\u00e0 c\u1ea5u h\u00ecnh SSH, VPN, DNS v\u00e0 t\u01b0\u1eddng l\u1eeda \u0111\u1ec3 thu\u1eadn ti\u1ec7n kh\u00f4i ph\u1ee5c.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"K\u1ebft_lu\u1eadn\"><strong>K\u1ebft lu\u1eadn<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00ecnh tr\u1ea1ng kh\u00f4ng truy c\u1eadp \u0111\u01b0\u1ee3c VPS c\u00f3 th\u1ec3 xu\u1ea5t ph\u00e1t t\u1eeb l\u1ed7i k\u1ebft n\u1ed1i \u0111\u01a1n gi\u1ea3n ho\u1eb7c s\u1ef1 c\u1ed1 c\u1ea5u h\u00ecnh b\u00ean trong m\u00e1y ch\u1ee7. \u0110\u1ec3 x\u1eed l\u00fd hi\u1ec7u qu\u1ea3, b\u1ea1n n\u00ean ki\u1ec3m tra th\u00f4ng b\u00e1o l\u1ed7i, tr\u1ea1ng th\u00e1i VPS, c\u1ed5ng k\u1ebft n\u1ed1i v\u00e0 d\u1ecbch v\u1ee5 SSH ho\u1eb7c Remote Desktop tr\u01b0\u1edbc khi th\u1ef1c hi\u1ec7n c\u00e1c thay \u0111\u1ed5i chuy\u00ean s\u00e2u.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu m\u1ea5t ho\u00e0n to\u00e0n quy\u1ec1n truy c\u1eadp, h\u00e3y \u01b0u ti\u00ean s\u1eed d\u1ee5ng Console\/VNC v\u00e0 ki\u1ec3m tra nguy\u00ean nh\u00e2n thay v\u00ec v\u1ed9i v\u00e0ng c\u00e0i l\u1ea1i h\u1ec7 \u0111i\u1ec1u h\u00e0nh. M\u1ed9t quy tr\u00ecnh qu\u1ea3n tr\u1ecb c\u00f3 sao l\u01b0u v\u00e0 ph\u01b0\u01a1ng \u00e1n k\u1ebft n\u1ed1i d\u1ef1 ph\u00f2ng s\u1ebd gi\u00fap h\u1ea1n ch\u1ebf r\u1ee7i ro trong nh\u1eefng l\u1ea7n x\u1eed l\u00fd s\u1ef1 c\u1ed1 ti\u1ebfp theo.<\/p>\n\n\n\n<h2 id=\"Nh\u1eefng_c\u00e2u_h\u1ecfi_th\u01b0\u1eddng_g\u1eb7p\"><strong>Nh\u1eefng c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/strong><\/h2>\n\n\n\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"VPS_v\u1eabn_Ping_\u0111\u01b0\u1ee3c_nh\u01b0ng_kh\u00f4ng_SSH_v\u00e0o_\u0111\u01b0\u1ee3c_l\u00e0_do_\u0111\u00e2u?\">VPS v\u1eabn Ping \u0111\u01b0\u1ee3c nh\u01b0ng kh\u00f4ng SSH v\u00e0o \u0111\u01b0\u1ee3c l\u00e0 do \u0111\u00e2u?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p class=\"wp-block-paragraph\">VPS v\u1eabn ph\u1ea3n h\u1ed3i Ping nh\u01b0ng kh\u00f4ng SSH \u0111\u01b0\u1ee3c th\u01b0\u1eddng cho th\u1ea5y ICMP ho\u1ea1t \u0111\u1ed9ng, trong khi k\u1ebft n\u1ed1i TCP \u0111\u1ebfn d\u1ecbch v\u1ee5 SSH \u0111ang g\u1eb7p v\u1ea5n \u0111\u1ec1. Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3 l\u00e0 d\u1ecbch v\u1ee5 SSH ng\u1eebng ho\u1ea1t \u0111\u1ed9ng, sai c\u1ed5ng ho\u1eb7c t\u01b0\u1eddng l\u1eeda ch\u1eb7n k\u1ebft n\u1ed1i. B\u1ea1n n\u00ean ki\u1ec3m tra c\u1ed5ng b\u1eb1ng Test-NetConnection tr\u01b0\u1edbc khi thay \u0111\u1ed5i c\u1ea5u h\u00ecnh.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"Thay_\u0111\u1ed5i_c\u1ed5ng_SSH_c\u00f3_th\u1ec3_khi\u1ebfn_VPS_m\u1ea5t_k\u1ebft_n\u1ed1i_kh\u00f4ng?\">Thay \u0111\u1ed5i c\u1ed5ng SSH c\u00f3 th\u1ec3 khi\u1ebfn VPS m\u1ea5t k\u1ebft n\u1ed1i kh\u00f4ng?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p class=\"wp-block-paragraph\">C\u00f3. N\u1ebfu thay \u0111\u1ed5i c\u1ed5ng SSH nh\u01b0ng ch\u01b0a c\u1eadp nh\u1eadt t\u01b0\u1eddng l\u1eeda ho\u1eb7c c\u1ea5u h\u00ecnh ph\u1ea7n m\u1ec1m k\u1ebft n\u1ed1i, b\u1ea1n c\u00f3 th\u1ec3 b\u1ecb kh\u00f3a truy c\u1eadp t\u1eeb xa. Khi c\u1ea7n thay \u0111\u1ed5i c\u1ed5ng, h\u00e3y chu\u1ea9n b\u1ecb Console d\u1ef1 ph\u00f2ng, ki\u1ec3m tra c\u1ea5u h\u00ecnh v\u00e0 th\u1eed \u0111\u0103ng nh\u1eadp b\u1eb1ng c\u1ed5ng m\u1edbi tr\u01b0\u1edbc khi \u0111\u00f3ng phi\u00ean \u0111ang ho\u1ea1t \u0111\u1ed9ng.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"C\u00f3_c\u1ea7n_Reboot_VPS_khi_kh\u00f4ng_th\u1ec3_k\u1ebft_n\u1ed1i_kh\u00f4ng?\">C\u00f3 c\u1ea7n Reboot VPS khi kh\u00f4ng th\u1ec3 k\u1ebft n\u1ed1i kh\u00f4ng?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p class=\"wp-block-paragraph\">Kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng c\u1ea7n. Reboot c\u00f3 th\u1ec3 h\u1eefu \u00edch n\u1ebfu h\u1ec7 \u0111i\u1ec1u h\u00e0nh ho\u1eb7c d\u1ecbch v\u1ee5 b\u1ecb treo, nh\u01b0ng kh\u00f4ng gi\u1ea3i quy\u1ebft \u0111\u01b0\u1ee3c m\u1ecdi l\u1ed7i li\u00ean quan \u0111\u1ebfn t\u01b0\u1eddng l\u1eeda, th\u00f4ng tin \u0111\u0103ng nh\u1eadp ho\u1eb7c sai c\u1ed5ng k\u1ebft n\u1ed1i. N\u00ean ki\u1ec3m tra tr\u1ea1ng th\u00e1i, nh\u1eadt k\u00fd v\u00e0 c\u1ea5u h\u00ecnh tr\u01b0\u1edbc khi quy\u1ebft \u0111\u1ecbnh kh\u1edfi \u0111\u1ed9ng l\u1ea1i.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"C\u00f3_n\u00ean_t\u1eaft_h\u1eb3n_firewall_\u0111\u1ec3_v\u00e0o_\u0111\u01b0\u1ee3c_VPS_kh\u00f4ng?\">C\u00f3 n\u00ean t\u1eaft h\u1eb3n firewall \u0111\u1ec3 v\u00e0o \u0111\u01b0\u1ee3c VPS kh\u00f4ng?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p class=\"wp-block-paragraph\">Ch\u1ec9 n\u00ean t\u1eaft t\u1ea1m th\u1eddi qua console \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh firewall c\u00f3 ph\u1ea3i nguy\u00ean nh\u00e2n hay kh\u00f4ng. Sau khi x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c, h\u00e3y b\u1eadt l\u1ea1i firewall v\u00e0 th\u00eam \u0111\u00fang quy t\u1eafc cho port SSH ho\u1eb7c RDP. \u0110\u1ec3 VPS ch\u1ea1y l\u00e2u d\u00e0i m\u00e0 kh\u00f4ng c\u00f3 firewall l\u00e0m t\u0103ng nguy c\u01a1 b\u1ecb d\u00f2 m\u1eadt kh\u1ea9u v\u00e0 t\u1ea5n c\u00f4ng.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section\t\thelp class=\"sc_fs_faq sc_card    \"\n\t\t\t\t>\n\t\t\t\t<h2 id=\"C\u00e0i_l\u1ea1i_VPS_(Rebuild)_c\u00f3_gi\u1ea3i_quy\u1ebft_\u0111\u01b0\u1ee3c_l\u1ed7i_kh\u00f4ng_v\u00e0o_\u0111\u01b0\u1ee3c_kh\u00f4ng?\">C\u00e0i l\u1ea1i VPS (Rebuild) c\u00f3 gi\u1ea3i quy\u1ebft \u0111\u01b0\u1ee3c l\u1ed7i kh\u00f4ng v\u00e0o \u0111\u01b0\u1ee3c kh\u00f4ng?<\/h2>\t\t\t\t<div>\n\t\t\t\t\t\t<div class=\"sc_fs_faq__content\">\n\t\t\t\t\n\n<p class=\"wp-block-paragraph\">C\u00f3, v\u00ec VPS s\u1ebd tr\u1edf v\u1ec1 c\u1ea5u h\u00ecnh m\u1eb7c \u0111\u1ecbnh v\u1edbi th\u00f4ng tin \u0111\u0103ng nh\u1eadp m\u1edbi. Tuy nhi\u00ean, Rebuild x\u00f3a to\u00e0n b\u1ed9 d\u1eef li\u1ec7u, website v\u00e0 c\u1ea5u h\u00ecnh hi\u1ec7n c\u00f3. Ch\u1ec9 n\u00ean ch\u1ecdn c\u00e1ch n\u00e0y khi \u0111\u00e3 th\u1eed h\u1ebft c\u00e1c b\u01b0\u1edbc s\u1eeda l\u1ed7i, \u0111\u00e3 sao l\u01b0u d\u1eef li\u1ec7u, ho\u1eb7c VPS kh\u00f4ng ch\u1ee9a d\u1eef li\u1ec7u quan tr\u1ecdng.<\/p>\n\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<\/section>\n\t\t\n<script type=\"application\/ld+json\">\n\t{\n\t\t\"@context\": \"https:\/\/schema.org\",\n\t\t\"@type\": \"FAQPage\",\n\t\t\"mainEntity\": [\n\t\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"VPS v\u1eabn Ping \u0111\u01b0\u1ee3c nh\u01b0ng kh\u00f4ng SSH v\u00e0o \u0111\u01b0\u1ee3c l\u00e0 do \u0111\u00e2u?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"<p>VPS v\u1eabn ph\u1ea3n h\u1ed3i Ping nh\u01b0ng kh\u00f4ng SSH \u0111\u01b0\u1ee3c th\u01b0\u1eddng cho th\u1ea5y ICMP ho\u1ea1t \u0111\u1ed9ng, trong khi k\u1ebft n\u1ed1i TCP \u0111\u1ebfn d\u1ecbch v\u1ee5 SSH \u0111ang g\u1eb7p v\u1ea5n \u0111\u1ec1. Nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3 l\u00e0 d\u1ecbch v\u1ee5 SSH ng\u1eebng ho\u1ea1t \u0111\u1ed9ng, sai c\u1ed5ng ho\u1eb7c t\u01b0\u1eddng l\u1eeda ch\u1eb7n k\u1ebft n\u1ed1i. B\u1ea1n n\u00ean ki\u1ec3m tra c\u1ed5ng b\u1eb1ng Test-NetConnection tr\u01b0\u1edbc khi thay \u0111\u1ed5i c\u1ea5u h\u00ecnh.<\/p>\"\n\t\t\t\t\t\t\t\t\t}\n\t\t\t}\n\t\t\t,\t\t\t\t{\n\t\t\t\t\"@type\": \"Question\",\n\t\t\t\t\"name\": \"Thay \u0111\u1ed5i c\u1ed5ng SSH c\u00f3 th\u1ec3 khi\u1ebfn VPS m\u1ea5t k\u1ebft n\u1ed1i kh\u00f4ng?\",\n\t\t\t\t\"acceptedAnswer\": {\n\t\t\t\t\t\"@type\": \"Answer\",\n\t\t\t\t\t\"text\": \"<p>C\u00f3. N\u1ebfu thay \u0111\u1ed5i c\u1ed5ng SSH nh\u01b0ng ch\u01b0a c\u1eadp nh\u1eadt t\u01b0\u1eddng l\u1eeda ho\u1eb7c c\u1ea5u h\u00ecnh ph\u1ea7n m\u1ec1m k\u1ebft n\u1ed1i, b\u1ea1n c\u00f3 th\u1ec3 b\u1ecb kh\u00f3a truy c\u1eadp t\u1eeb xa. 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Ph\u1ea7n l\u1edbn tr\u01b0\u1eddng h\u1ee3p \u0111\u1ebfn t\u1eeb firewall [&hellip;]<\/p>\n","protected":false},"author":23,"featured_media":132507,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7377],"tags":[7737],"class_list":["post-132341","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-loi-thuong-gap","tag-loi-thuong-gap"],"_links":{"self":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts\/132341","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/users\/23"}],"replies":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/comments?post=132341"}],"version-history":[{"count":6,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts\/132341\/revisions"}],"predecessor-version":[{"id":132536,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts\/132341\/revisions\/132536"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/media\/132507"}],"wp:attachment":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/media?parent=132341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/categories?post=132341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/tags?post=132341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}