{"id":4779,"date":"2020-04-15T20:21:14","date_gmt":"2020-04-15T13:21:14","guid":{"rendered":"https:\/\/tino.vn\/?post_type=ht_kb&p=4779"},"modified":"2020-04-15T20:21:14","modified_gmt":"2020-04-15T13:21:14","slug":"huong-dan-xu-ly-loi-error-521","status":"publish","type":"ht_kb","link":"https:\/\/tino.vn\/blog\/docs\/huong-dan-xu-ly-loi-error-521\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn x\u1eed l\u00fd l\u1ed7i “Error 521”"},"content":{"rendered":"

Th\u00f4ng b\u00e1o “Error 521” l\u00e0 th\u00f4ng b\u00e1o l\u1ed7i d\u00e0nh ri\u00eang cho Cloudflare.<\/span><\/p>\n

V\u1ec1 c\u01a1 b\u1ea3n, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 tr\u00ecnh duy\u1ec7t web c\u1ee7a b\u1ea1n \u0111\u00e3 c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i th\u00e0nh c\u00f4ng v\u1edbi Cloudflare, nh\u01b0ng Cloudflare kh\u00f4ng th\u1ec3 k\u1ebft n\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 web <\/span><\/p>\n

C\u1ee5 th\u1ec3, Cloudflare \u0111\u00e3 c\u1ed1 g\u1eafng k\u1ebft n\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 trang web WordPress c\u1ee7a b\u1ea1n nh\u01b0ng nh\u1eadn \u0111\u01b0\u1ee3c\u00a0<\/span>l\u1ed7i t\u1eeb ch\u1ed1i k\u1ebft n\u1ed1i<\/span>\u00a0.<\/span><\/p>\n

V\u00ec Cloudflare kh\u00f4ng th\u1ec3 k\u1ebft n\u1ed1i v\u1edbi trang web c\u1ee7a b\u1ea1n, n\u00ean n\u00f3 kh\u00f4ng th\u1ec3 hi\u1ec3n th\u1ecb trang web c\u1ee7a b\u1ea1n cho kh\u00e1ch truy c\u1eadp v\u00e0 thay v\u00e0o \u0111\u00f3 hi\u1ec3n th\u1ecb th\u00f4ng b\u00e1o “Error 521”<\/span><\/p>\n

\u0110i\u1ec1u g\u00ec c\u00f3 th\u1ec3 g\u00e2y ra “Error 521”<\/span><\/p>\n

Th\u01b0\u1eddng th\u00ec l\u1ed7i tr\u00ean g\u00e2y ra b\u1edfi m\u1ed9t trong hai t\u00ecnh hu\u1ed1ng:<\/p>\n

\u0110\u1ea7u ti\u00ean, m\u00e1y ch\u1ee7 trang web WordPress c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 ng\u1eebng ho\u1ea1t \u0111\u1ed9ng.\u00a0Ngay c\u1ea3 khi m\u1ecdi th\u1ee9 kh\u00e1c \u0111\u01b0\u1ee3c \u0111\u1ecbnh c\u1ea5u h\u00ecnh \u0111\u00fang, n\u1ebfu m\u00e1y ch\u1ee7 trang web WordPress c\u1ee7a b\u1ea1n ngo\u1ea1i tuy\u1ebfn, Cloudflare ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 kh\u00f4ng th\u1ec3 k\u1ebft n\u1ed1i.<\/span><\/p>\n

Th\u1ee9 hai, m\u00e1y ch\u1ee7 web c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 \u0111ang ch\u1ea1y t\u1ed1t nh\u01b0ng v\u00ec l\u00fd do n\u00e0o \u0111\u00f3 ch\u1eb7n c\u00e1c y\u00eau c\u1ea7u c\u1ee7a Cloudflare.\u00a0Do c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Cloudflare, m\u1ed9t s\u1ed1 gi\u1ea3i ph\u00e1p b\u1ea3o m\u1eadt ph\u00eda m\u00e1y ch\u1ee7 c\u00f3 th\u1ec3 v\u00f4 t\u00ecnh ch\u1eb7n c\u00e1c \u0111\u1ecba ch\u1ec9 IP c\u1ee7a Cloudflare.<\/span><\/p>\n

C\u00e1ch kh\u1eafc ph\u1ee5c l\u1ed7i “Error 521” cho Cloudflare v\u00e0 WordPress<\/span><\/p>\n

B\u1ea1n c\u00f3 th\u1ec3 ki\u1ec3m tra theo c\u00e1c b\u01b0\u1edbc sau:<\/p>\n

B\u01b0\u1edbc 1: ki\u1ec3m tra server c\u00f3 ho\u1ea1t \u0111\u00f4ng kh\u00f4ng b\u1eb1ng c\u00f4ng c\u1ee5 CURL<\/em><\/p>\n

b\u1ea1n c\u00f3 th\u1ec3 truy c\u1eadp website t\u1ea1i \u0111\u00e2y<\/a> v\u00e0\u00a0 nh\u1eadp v\u00e0o IP c\u1ea7n ki\u1ec3m tra v\u1edbi giao th\u1ee9c http \u0111\u1ec3 ki\u1ec3m tra ph\u1ea3n h\u1ed3i qua port 80<\/p>\n

\"\"<\/a><\/p>\n

 <\/p>\n

N\u1ebfu m\u00e1y ch\u1ee7 c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng, b\u1ea1n s\u1ebd th\u1ea5y\u00a0ph\u1ea3n h\u1ed3i\u00a0<\/span>HTTP\/1.1 200 OK<\/span><\/strong><\/p>\n

B\u01b0\u1edbc 2.\u00a0 Th\u00eam danh s\u00e1ch IP c\u1ee7a cloudflare v\u00e0o h\u1ec7 th\u1ed1ng t\u01b0\u1eddng l\u1eeda m\u00e1y ch\u1ee7 webserver<\/span><\/em><\/p>\n

Th\u01b0\u1eddng th\u00ec \u0111\u1ed1i v\u1edbi\u00a0 c\u00e1c d\u1ecbch v\u1ee5 hosting \u0111\u00e3 th\u00eam s\u1eb5n IP c\u1ee7a cloudflare, c\u00f2n n\u1ebfu b\u1ea1n d\u00f9ng c\u00e1c d\u1ecbch v\u1ee5 kh\u00e1c\u00a0 th\u00ec c\u00f3 th\u1ec3 li\u00ean h\u1ec7 \u0111\u1ebfn ng\u01b0\u1eddi qu\u1ea3n tr\u1ecb h\u1ec7\u00a0 th\u1ed1ng webserver ho\u1eb7c \u0111\u01a1n v\u1ee5 cung c\u1ea5p\u00a0 d\u1ecbch v\u1ee5 \u0111\u1ec3 c\u00f3 th\u1ec3 h\u1ed7 tr\u1ee3.<\/p>\n

B\u01b0\u1edbc 3: Xem x\u00e9t c\u00e1c v\u1ea5n \u0111\u1ec1 c\u1ee5 th\u1ec3 h\u01a1n<\/em><\/p>\n

Cu\u1ed1i c\u00f9ng, \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u01b0\u1edbc k\u1ef9 thu\u1eadt c\u1ee5 th\u1ec3 h\u01a1n m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n, t\u00f9y thu\u1ed9c v\u00e0o c\u1ea5u h\u00ecnh m\u00e1y ch\u1ee7 c\u1ee7a b\u1ea1n.<\/p>\n

1) N\u1ebfu b\u1ea1n m\u1edbi b\u1eaft \u0111\u1ea7u s\u1eed d\u1ee5ng HTTPS c\u1ee7a Cloudflare, m\u00e1y ch\u1ee7 g\u1ed1c c\u1ee7a b\u1ea1n c\u00f3 th\u1ec3 kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u1ecbnh c\u1ea5u h\u00ecnh \u0111\u1ec3 cho ph\u00e9p c\u00e1c \u0111\u1ecba ch\u1ec9 IP c\u1ee7a Cloudflare truy c\u1eadp c\u1ed5ng 443. N\u1ebfu b\u1ea1n kh\u00f4ng th\u1ec3 \u0111\u1ecbnh c\u1ea5u h\u00ecnh t\u01b0\u1eddng l\u1eeda c\u1ee7a m\u00ecnh \u0111\u1ec3 cho ph\u00e9p \u0111i\u1ec1u n\u00e0y, h\u00e3y th\u1eed s\u1eed d\u1ee5ng Flexible SSL<\/strong> thay v\u00ec Full SSL<\/strong> t\u1ea1i Cloudflare.<\/p>\n

2) \u0110\u1ea3m b\u1ea3o b\u1ea1n \u0111ang s\u1eed d\u1ee5ng c\u00e1c phi\u00ean b\u1ea3n m\u1edbi nh\u1ea5t c\u1ee7a H\u00e0nh vi x\u1ea5u ho\u1eb7c mod_security<\/strong> , n\u1ebfu c\u00f3.<\/p>\n

3) N\u1ebfu b\u1ea1n \u0111ang s\u1eed d\u1ee5ng mod_antiloris<\/strong> ho\u1eb7c mod_reqtimeout<\/strong> module Apache, v\u00f4 hi\u1ec7u h\u00f3a v\u00e0 d\u1ee1 b\u1ecf\u00a0 ch\u00fang.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Th\u00f4ng b\u00e1o “Error 521” l\u00e0 th\u00f4ng b\u00e1o l\u1ed7i d\u00e0nh ri\u00eang cho Cloudflare. V\u1ec1 c\u01a1 b\u1ea3n, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 tr\u00ecnh duy\u1ec7t web c\u1ee7a b\u1ea1n \u0111\u00e3 c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i th\u00e0nh c\u00f4ng v\u1edbi Cloudflare, nh\u01b0ng Cloudflare kh\u00f4ng th\u1ec3 k\u1ebft n\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 web C\u1ee5 th\u1ec3, Cloudflare \u0111\u00e3 c\u1ed1 g\u1eafng k\u1ebft n\u1ed1i v\u1edbi m\u00e1y ch\u1ee7 […]<\/p>\n","protected":false},"author":11,"featured_media":16424,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"tags":[],"ht_kb_category":[5167],"class_list":["post-4779","ht_kb","type-ht_kb","status-publish","format-standard","has-post-thumbnail","hentry","ht_kb_category-cau-hoi-chung-ve-wordpress"],"_links":{"self":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/ht_kb\/4779","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/ht_kb"}],"about":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/comments?post=4779"}],"version-history":[{"count":0,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/ht_kb\/4779\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/media\/16424"}],"wp:attachment":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/media?parent=4779"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/tags?post=4779"},{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/ht_kb_category?post=4779"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}