{"id":22079,"date":"2025-10-20T17:01:54","date_gmt":"2025-10-20T10:01:54","guid":{"rendered":"https:\/\/interdata.vn\/blog\/?p=22079"},"modified":"2025-10-21T09:09:33","modified_gmt":"2025-10-21T02:09:33","slug":"loi-502-bad-gateway-la-gi","status":"publish","type":"post","link":"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/","title":{"rendered":"L\u1ed7i 502 Bad Gateway L\u00e0 G\u00ec? Nguy\u00ean Nh\u00e2n &#038; 12+ C\u00e1ch S\u1eeda L\u1ed7i"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed8I DUNG<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#Loi-502-Bad-Gateway-la-gi\" >L\u1ed7i 502 Bad Gateway l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#Nguyen-nhan-gay-ra-loi-502-Bad-Gateway-la-gi\" >Nguy\u00ean nh\u00e2n g\u00e2y ra l\u1ed7i 502 Bad Gateway l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#Loi-502-Bad-Gateway-co-anh-huong-den-SEO-khong\" >L\u1ed7i 502 Bad Gateway c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn SEO kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#12-cach-sua-loi-502-Bad-Gateway-tham-khao\" >12 c\u00e1ch s\u1eeda l\u1ed7i 502 Bad Gateway tham kh\u1ea3o<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#1-Tai-lai-trang-web\" >1. T\u1ea3i l\u1ea1i trang web<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#2-Khoi-dong-lai-trinh-duyet\" >2. Kh\u1edfi \u0111\u1ed9ng l\u1ea1i tr\u00ecnh duy\u1ec7t<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#3-Thu-su-dung-trinh-duyet-khac-hoac-che-do-an-danh\" >3. Th\u1eed s\u1eed d\u1ee5ng tr\u00ecnh duy\u1ec7t kh\u00e1c ho\u1eb7c ch\u1ebf \u0111\u1ed9 \u1ea9n danh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#4-Kiem-tra-va-khoi-dong-lai-thiet-bi-mang\" >4. Ki\u1ec3m tra v\u00e0 kh\u1edfi \u0111\u1ed9ng l\u1ea1i thi\u1ebft b\u1ecb m\u1ea1ng<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#5-Xoa-bo-nho-cache-va-cookie-cua-trinh-duyet\" >5. X\u00f3a b\u1ed9 nh\u1edb cache v\u00e0 cookie c\u1ee7a tr\u00ecnh duy\u1ec7t<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#6-Thay-doi-DNS\" >6. Thay \u0111\u1ed5i DNS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#7-Xoa-bo-nho-cache-DNS\" >7. X\u00f3a b\u1ed9 nh\u1edb cache DNS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#8-Kiem-tra-Extension\" >8. Ki\u1ec3m tra Extension<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#9-Su-dung-trinh-duyet-o-che-do-Safe-Mode\" >9. S\u1eed d\u1ee5ng tr\u00ecnh duy\u1ec7t \u1edf ch\u1ebf \u0111\u1ed9 Safe Mode<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#10-Kiem-tra-Error-Log\" >10. Ki\u1ec3m tra Error Log<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#11-Kiem-tra-CDNs\" >11. Ki\u1ec3m tra CDNs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#12-Lien-he-voi-quan-tri-vien-trang-web\" >12. Li\u00ean h\u1ec7 v\u1edbi qu\u1ea3n tr\u1ecb vi\u00ean trang web<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#Loi-502-khac-gi-so-voi-loi-500-503-va-504\" >L\u1ed7i 502 kh\u00e1c g\u00ec so v\u1edbi l\u1ed7i 500, 503 v\u00e0 504?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#Loi-502-Bad-Gateway\" >L\u1ed7i 502 (Bad Gateway)\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#Loi-500-Internal-Server-Error\" >L\u1ed7i 500 (Internal Server Error)\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#Loi-503-Service-Unavailable\" >L\u1ed7i 503 (Service Unavailable)\u00a0<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/#Loi-504-Gateway-Timeout\" >L\u1ed7i 504 (Gateway Timeout)\u00a0<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<p>L\u1ed7i 502 Bad Gateway l\u00e0 m\u1ed9t trong nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn khi truy c\u1eadp c\u00e1c trang web, khi\u1ebfn ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng th\u1ec3 k\u1ebft n\u1ed1i \u0111\u1ebfn n\u1ed9i dung h\u1ecd c\u1ea7n. L\u1ed7i kh\u00f4ng ch\u1ec9 g\u00e2y phi\u1ec1n to\u00e1i cho ng\u01b0\u1eddi d\u00f9ng m\u00e0 c\u00f2n \u1ea3nh h\u01b0\u1edfng nghi\u00eam tr\u1ecdng \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a website, \u0111\u1eb7c bi\u1ec7t trong l\u0129nh v\u1ef1c SEO. D\u01b0\u1edbi \u0111\u00e2y, c\u00f9ng t\u00ecm hi\u1ec3u <a href=\"https:\/\/interdata.vn\/blog\/loi-502-bad-gateway-la-gi\/\"><strong>l\u1ed7i 502 Bad Gateway l\u00e0 g\u00ec<\/strong><\/a>, nguy\u00ean nh\u00e2n g\u00e2y ra l\u1ed7i 502, t\u00e1c \u0111\u1ed9ng c\u1ee7a n\u00f3 \u0111\u1ebfn SEO nh\u01b0 th\u1ebf n\u00e0o v\u00e0 g\u1ee3i \u00fd 12 c\u00e1ch kh\u1eafc ph\u1ee5c l\u1ed7i 502 hi\u1ec7u qu\u1ea3 nh\u1ea5t.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Loi-502-Bad-Gateway-la-gi\"><\/span>L\u1ed7i 502 Bad Gateway l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p><strong>L\u1ed7i 502 Bad Gateway<\/strong> l\u00e0 m\u1ed9t trong nh\u1eefng l\u1ed7i th\u01b0\u1eddng g\u1eb7p khi truy c\u1eadp v\u00e0o c\u00e1c trang web. L\u1ed7i 502 Bad Gateway c\u00f3 ngh\u0129a l\u00e0 server gateway (m\u1ed9t server \u0111\u00f3ng vai tr\u00f2 l\u00e0m c\u1ea7u n\u1ed1i gi\u1eefa thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n v\u00e0 web server) kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i h\u1ee3p l\u1ec7 t\u1eeb web server.<\/p>\r\n<figure id=\"attachment_22085\" aria-describedby=\"caption-attachment-22085\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-22085\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Loi-502-Bad-Gateway-la-gi.jpg\" alt=\"L\u1ed7i 502 Bad Gateway l\u00e0 g\u00ec?\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Loi-502-Bad-Gateway-la-gi.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Loi-502-Bad-Gateway-la-gi-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Loi-502-Bad-Gateway-la-gi-768x480.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Loi-502-Bad-Gateway-la-gi-750x469.jpg 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-22085\" class=\"wp-caption-text\">L\u1ed7i 502 Bad Gateway l\u00e0 g\u00ec?<\/figcaption><\/figure>\r\n<p>Th\u00f4ng th\u01b0\u1eddng, khi b\u1ea1n y\u00eau c\u1ea7u truy c\u1eadp v\u00e0o m\u1ed9t trang web, tr\u00ecnh duy\u1ec7t c\u1ee7a b\u1ea1n s\u1ebd g\u1eedi y\u00eau c\u1ea7u \u0111\u1ebfn server c\u1ee7a trang web \u0111\u00f3. N\u1ebfu server c\u1ee7a trang web kh\u00f4ng ph\u1ea3n h\u1ed3i ho\u1eb7c ph\u1ea3n h\u1ed3i sai, b\u1ea1n s\u1ebd nh\u1eadn \u0111\u01b0\u1ee3c l\u1ed7i 502 Bad Gateway. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 b\u1ea1n kh\u00f4ng th\u1ec3 xem \u0111\u01b0\u1ee3c n\u1ed9i dung c\u1ee7a trang web.<\/p>\r\n<p>L\u1ed7i 502 Bad Gateway c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n v\u1edbi nhi\u1ec1u h\u00ecnh th\u1ee9c kh\u00e1c nhau nh\u01b0:<\/p>\r\n<ul>\r\n<li>502 Bad Gateway<\/li>\r\n<li>502 Service Temporarily Overloaded<\/li>\r\n<li>Error 502<\/li>\r\n<li>Temporary Error (502)<\/li>\r\n<li>502 Proxy Error<\/li>\r\n<li>502 Server Error: The server encountered a temporary error and could not complete your request<\/li>\r\n<li>HTTP Error 502 &#8211; Bad Gateway<\/li>\r\n<li>502 &#8211; That&#8217;s an error<\/li>\r\n<li>Bad Gateway: The proxy server received an invalid response from an upstream server<\/li>\r\n<\/ul>\r\n<h2><span class=\"ez-toc-section\" id=\"Nguyen-nhan-gay-ra-loi-502-Bad-Gateway-la-gi\"><\/span>Nguy\u00ean nh\u00e2n g\u00e2y ra l\u1ed7i 502 Bad Gateway l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>\u0110\u1ec3 kh\u1eafc ph\u1ee5c hi\u1ec7u qu\u1ea3 l\u1ed7i 502 Bad Gateway, tr\u01b0\u1edbc ti\u00ean, ch\u00fang ta c\u1ea7n hi\u1ec3u r\u00f5 nguy\u00ean nh\u00e2n g\u00e2y ra l\u1ed7i n\u00e0y. M\u1ed9t s\u1ed1 l\u00fd do ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\r\n<ul>\r\n<li><strong>Server b\u1ecb qu\u00e1 t\u1ea3i<\/strong>: Khi c\u00f3 qu\u00e1 nhi\u1ec1u ng\u01b0\u1eddi truy c\u1eadp v\u00e0o trang web c\u00f9ng m\u1ed9t l\u00fac, t\u00e0i nguy\u00ean b\u1ed9 nh\u1edb c\u1ee7a server c\u00f3 th\u1ec3 b\u1ecb c\u1ea1n ki\u1ec7t. Ngo\u00e0i ra, n\u1ebfu server b\u1ecb t\u1ea5n c\u00f4ng DDoS, n\u00f3 c\u0169ng c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn t\u00ecnh tr\u1ea1ng ng\u1eebng ho\u1ea1t \u0111\u1ed9ng.<\/li>\r\n<li><strong>T\u01b0\u1eddng l\u1eeda ch\u1eb7n li\u00ean l\u1ea1c gi\u1eefa c\u00e1c server<\/strong>: M\u1ed9t s\u1ed1 h\u1ec7 th\u1ed1ng b\u1ea3o v\u1ec7 ch\u1ed1ng DDoS \u0111\u00f4i khi ho\u1ea1t \u0111\u1ed9ng qu\u00e1 m\u1ee9c, d\u1eabn \u0111\u1ebfn vi\u1ec7c ch\u1eb7n c\u00e1c y\u00eau c\u1ea7u truy c\u1eadp h\u1ee3p l\u1ec7 t\u1eeb m\u00e1y t\u00ednh c\u1ee7a b\u1ea1n.<\/li>\r\n<li><strong>L\u1ed7i l\u1eadp tr\u00ecnh<\/strong>: N\u1ebfu trang web g\u1eb7p l\u1ed7i trong m\u00e3 ngu\u1ed3n, n\u00f3 c\u00f3 th\u1ec3 khi\u1ebfn server kh\u00f4ng ph\u1ea3n h\u1ed3i \u0111\u00fang c\u00e1ch, d\u1eabn \u0111\u1ebfn l\u1ed7i 502 Bad Gateway.<\/li>\r\n<li><strong>S\u1ef1 c\u1ed1 m\u1ea1ng<\/strong>: C\u00e1c v\u1ea5n \u0111\u1ec1 nh\u01b0 l\u1ed7i DNS, s\u1ef1 c\u1ed1 t\u1eeb nh\u00e0 cung c\u1ea5p d\u1ecbch v\u1ee5 Internet (ISP),&#8230; c\u0169ng c\u00f3 th\u1ec3 l\u00e0 nguy\u00ean nh\u00e2n g\u00e2y ra l\u1ed7i n\u00e0y.<\/li>\r\n<li><strong>H\u1ebft th\u1eddi gian ch\u1edd<\/strong>: Khi web server m\u1ea5t qu\u00e1 nhi\u1ec1u th\u1eddi gian \u0111\u1ec3 x\u1eed l\u00fd y\u00eau c\u1ea7u, h\u1ec7 th\u1ed1ng s\u1ebd tr\u1ea3 v\u1ec1 l\u1ed7i 502 Bad Gateway.<\/li>\r\n<\/ul>\r\n<p>Hi\u1ec3u \u0111\u01b0\u1ee3c nh\u1eefng nguy\u00ean nh\u00e2n tr\u00ean s\u1ebd gi\u00fap b\u1ea1n t\u00ecm ra c\u00e1ch x\u1eed l\u00fd ph\u00f9 h\u1ee3p \u0111\u1ec3 kh\u1eafc ph\u1ee5c l\u1ed7i 502 m\u1ed9t c\u00e1ch nhanh ch\u00f3ng.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Loi-502-Bad-Gateway-co-anh-huong-den-SEO-khong\"><\/span>L\u1ed7i 502 Bad Gateway c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn SEO kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>L\u1ed7i 502 Bad Gateway c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng ti\u00eau c\u1ef1c \u0111\u1ebfn SEO c\u1ee7a trang web n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c kh\u1eafc ph\u1ee5c k\u1ecbp th\u1eddi. Khi trang web g\u1eb7p l\u1ed7i n\u00e0y trong th\u1eddi gian d\u00e0i, ch\u1eb3ng h\u1ea1n h\u01a1n 6 gi\u1edd, Google c\u00f3 th\u1ec3 coi \u0111\u00e2y l\u00e0 v\u1ea5n \u0111\u1ec1 nghi\u00eam tr\u1ecdng c\u1ea7n gi\u1ea3i quy\u1ebft, d\u1eabn \u0111\u1ebfn vi\u1ec7c gi\u1ea3m th\u1ee9 h\u1ea1ng trang web tr\u00ean k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm.<\/p>\r\n<figure id=\"attachment_22086\" aria-describedby=\"caption-attachment-22086\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-22086\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Loi-502-Bad-Gateway-co-anh-huong-gi-den-SEO.webp\" alt=\"L\u1ed7i 502 Bad Gateway c\u00f3 \u1ea3nh h\u01b0\u1edfng g\u00ec \u0111\u1ebfn SEO\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Loi-502-Bad-Gateway-co-anh-huong-gi-den-SEO.webp 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Loi-502-Bad-Gateway-co-anh-huong-gi-den-SEO-300x188.webp 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Loi-502-Bad-Gateway-co-anh-huong-gi-den-SEO-768x480.webp 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Loi-502-Bad-Gateway-co-anh-huong-gi-den-SEO-750x469.webp 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-22086\" class=\"wp-caption-text\">L\u1ed7i 502 Bad Gateway c\u00f3 \u1ea3nh h\u01b0\u1edfng g\u00ec \u0111\u1ebfn SEO<\/figcaption><\/figure>\r\n<p>Ngo\u00e0i ra, l\u1ed7i 502 th\u01b0\u1eddng xuy\u00ean khi\u1ebfn ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng th\u1ec3 truy c\u1eadp trang, l\u00e0m t\u0103ng t\u1ef7 l\u1ec7 tho\u00e1t v\u00e0 gi\u1ea3m uy t\u00edn c\u1ee7a trang web. \u0110i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp t\u1ef1 nhi\u00ean v\u00e0 hi\u1ec7u qu\u1ea3 c\u1ee7a c\u00e1c ho\u1ea1t \u0111\u1ed9ng SEO. Do \u0111\u00f3, vi\u1ec7c nhanh ch\u00f3ng x\u00e1c \u0111\u1ecbnh nguy\u00ean nh\u00e2n v\u00e0 kh\u1eafc ph\u1ee5c l\u1ed7i 502 Bad Gateway l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 duy tr\u00ec hi\u1ec7u su\u1ea5t v\u00e0 th\u1ee9 h\u1ea1ng c\u1ee7a trang web tr\u00ean c\u00e1c c\u00f4ng c\u1ee5 t\u00ecm ki\u1ebfm.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"12-cach-sua-loi-502-Bad-Gateway-tham-khao\"><\/span>12 c\u00e1ch s\u1eeda l\u1ed7i 502 Bad Gateway tham kh\u1ea3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>C\u00e1ch kh\u1eafc ph\u1ee5c l\u1ed7i 502 Bad Gateway c\u00f3 th\u1ec3 kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o nguy\u00ean nh\u00e2n g\u00e2y ra l\u1ed7i.\u00a0\u0110\u1ec3 kh\u1eafc ph\u1ee5c l\u1ed7i 502 Bad Gateway, b\u1ea1n c\u00f3 th\u1ec3 th\u1eed 12 bi\u1ec7n ph\u00e1p sau:<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"1-Tai-lai-trang-web\"><\/span>1. T\u1ea3i l\u1ea1i trang web<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Nh\u1ea5n ph\u00edm <strong>F5<\/strong> ho\u1eb7c ch\u1ecdn n\u00fat &#8220;<strong>Refresh<\/strong>&#8221; \/ &#8220;<strong>Reload<\/strong>&#8221; tr\u00ean tr\u00ecnh duy\u1ec7t \u0111\u1ec3 t\u1ea3i l\u1ea1i trang. N\u1ebfu l\u1ed7i kh\u00f4ng c\u00f2n xu\u1ea5t hi\u1ec7n, c\u00f3 th\u1ec3 \u0111\u00f3 ch\u1ec9 l\u00e0 s\u1ef1 c\u1ed1 t\u1ea1m th\u1eddi.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"2-Khoi-dong-lai-trinh-duyet\"><\/span>2. Kh\u1edfi \u0111\u1ed9ng l\u1ea1i tr\u00ecnh duy\u1ec7t<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>\u0110\u00f3ng t\u1ea5t c\u1ea3 c\u00e1c tab v\u00e0 c\u1eeda s\u1ed5 c\u1ee7a tr\u00ecnh duy\u1ec7t, sau \u0111\u00f3 m\u1edf l\u1ea1i v\u00e0 th\u1eed truy c\u1eadp trang web. \u0110i\u1ec1u n\u00e0y gi\u00fap gi\u1ea3i quy\u1ebft c\u00e1c s\u1ef1 c\u1ed1 nh\u1ecf x\u1ea3y ra trong qu\u00e1 tr\u00ecnh duy\u1ec7t web.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"3-Thu-su-dung-trinh-duyet-khac-hoac-che-do-an-danh\"><\/span>3. Th\u1eed s\u1eed d\u1ee5ng tr\u00ecnh duy\u1ec7t kh\u00e1c ho\u1eb7c ch\u1ebf \u0111\u1ed9 \u1ea9n danh<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>Th\u1eed truy c\u1eadp trang web b\u1eb1ng m\u1ed9t tr\u00ecnh duy\u1ec7t kh\u00e1c ho\u1eb7c s\u1eed d\u1ee5ng ch\u1ebf \u0111\u1ed9 \u1ea9n danh. N\u1ebfu truy c\u1eadp th\u00e0nh c\u00f4ng, nguy\u00ean nh\u00e2n c\u00f3 th\u1ec3 do tr\u00ecnh duy\u1ec7t ban \u0111\u1ea7u g\u1eb7p s\u1ef1 c\u1ed1. B\u1ea1n c\u00f3 th\u1ec3 g\u1ee1 c\u00e0i \u0111\u1eb7t v\u00e0 c\u00e0i \u0111\u1eb7t l\u1ea1i tr\u00ecnh duy\u1ec7t \u0111\u1ec3 kh\u1eafc ph\u1ee5c.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"4-Kiem-tra-va-khoi-dong-lai-thiet-bi-mang\"><\/span>4. Ki\u1ec3m tra v\u00e0 kh\u1edfi \u0111\u1ed9ng l\u1ea1i thi\u1ebft b\u1ecb m\u1ea1ng<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>C\u00e1c s\u1ef1 c\u1ed1 tr\u00ean modem, router ho\u1eb7c c\u00e1c thi\u1ebft b\u1ecb m\u1ea1ng kh\u00e1c c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn l\u1ed7i 502. H\u00e3y kh\u1edfi \u0111\u1ed9ng l\u1ea1i c\u00e1c thi\u1ebft b\u1ecb n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o k\u1ebft n\u1ed1i \u1ed5n \u0111\u1ecbnh gi\u00fap gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 l\u1ed7i 502 Bad Gateway.<\/p>\r\n<figure id=\"attachment_22087\" aria-describedby=\"caption-attachment-22087\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-22087\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Kiem-tra-ket-noi-mang.jpg\" alt=\"Ki\u1ec3m tra k\u1ebft n\u1ed1i m\u1ea1ng\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Kiem-tra-ket-noi-mang.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Kiem-tra-ket-noi-mang-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Kiem-tra-ket-noi-mang-768x480.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Kiem-tra-ket-noi-mang-750x469.jpg 750w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-22087\" class=\"wp-caption-text\">Ki\u1ec3m tra k\u1ebft n\u1ed1i m\u1ea1ng<\/figcaption><\/figure>\r\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5-Xoa-bo-nho-cache-va-cookie-cua-trinh-duyet\"><\/span>5. X\u00f3a b\u1ed9 nh\u1edb cache v\u00e0 cookie c\u1ee7a tr\u00ecnh duy\u1ec7t<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<!-- \/wp:post-content -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>B\u1ed9 nh\u1edb cache c\u00f3 th\u1ec3 khi\u1ebfn tr\u00ecnh duy\u1ec7t kh\u00f4ng c\u1eadp nh\u1eadt d\u1eef li\u1ec7u m\u1edbi sau khi l\u1ed7i 502 \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eeda. Vi\u1ec7c x\u00f3a cache v\u00e0 cookie gi\u00fap tr\u00ecnh duy\u1ec7t t\u1ea3i l\u1ea1i d\u1eef li\u1ec7u m\u1edbi nh\u1ea5t t\u1eeb trang web.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>B\u1ea1n c\u00f3 th\u1ec3 x\u00f3a b\u1ed9 nh\u1edb cache v\u00e0 cookie c\u1ee7a tr\u00ecnh duy\u1ec7t b\u1eb1ng c\u00e1ch <strong>v\u00e0o menu C\u00e0i \u0111\u1eb7t<\/strong> c\u1ee7a tr\u00ecnh duy\u1ec7t <strong>&gt;<\/strong> ch\u1ecdn<strong> L\u1ecbch s\u1eed<\/strong> <strong>&gt;<\/strong> ch\u1ecdn <strong>X\u00f3a d\u1eef li\u1ec7u duy\u1ec7t web<\/strong>. B\u1ea1n n\u00ean ch\u1ecdn t\u1ea5t c\u1ea3 c\u00e1c t\u00f9y ch\u1ecdn li\u00ean quan \u0111\u1ebfn b\u1ed9 nh\u1edb cache v\u00e0 cookie v\u00e0 <strong>nh\u1ea5n X\u00f3a<\/strong>.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"6-Thay-doi-DNS\"><\/span>6. Thay \u0111\u1ed5i DNS<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>N\u1ebfu b\u1ea1n l\u00e0 qu\u1ea3n tr\u1ecb vi\u00ean web v\u00e0 v\u1eeba chuy\u1ec3n \u0111\u1ed5i d\u1ecbch v\u1ee5 hosting ho\u1eb7c thay \u0111\u1ed5i \u0111\u1ecba ch\u1ec9 IP, qu\u00e1 tr\u00ecnh n\u00e0y c\u00f3 th\u1ec3 m\u1ea5t v\u00e0i gi\u1edd \u0111\u1ec3 ho\u00e0n t\u1ea5t, khi\u1ebfn ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng th\u1ec3 truy c\u1eadp ngay l\u1eadp t\u1ee9c. N\u1ebfu b\u1ea1n l\u00e0 ng\u01b0\u1eddi d\u00f9ng, th\u1eed thay \u0111\u1ed5i DNS tr\u00ean m\u00e1y t\u00ednh b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng DNS c\u00f4ng c\u1ed9ng nh\u01b0 Google Public DNS \u0111\u1ec3 truy c\u1eadp trang web.<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"7-Xoa-bo-nho-cache-DNS\"><\/span>7. X\u00f3a b\u1ed9 nh\u1edb cache DNS<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<p>B\u1ed9 nh\u1edb cache DNS c\u0169 ho\u1eb7c sai c\u00f3 th\u1ec3 g\u00e2y ra l\u1ed7i 502. \u0110\u1ec3 x\u00f3a cache DNS tr\u00ean Windows v\u00e0 MacOS, h\u00e3y th\u1ef1c hi\u1ec7n theo c\u00e1ch sau:<\/p>\r\n<h4>7.1 X\u00f3a cache DNS tr\u00ean Windows<\/h4>\r\n<p><strong>B\u01b0\u1edbc 1: <\/strong>Nh\u1ea5n ph\u00edm <strong>Windows + R<\/strong>, sau \u0111\u00f3 nh\u1eadp <strong><em>&#8220;cmd&#8221;<\/em><\/strong> v\u00e0 <strong>nh\u1ea5n OK<\/strong> \u0111\u1ec3 m\u1edf c\u1eeda s\u1ed5 l\u1ec7nh Windows.<\/p>\r\n<figure id=\"attachment_22081\" aria-describedby=\"caption-attachment-22081\" style=\"width: 960px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-22081\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Mo-Command-Prompt-Windows.jpg\" alt=\"M\u1edf Command Prompt - Windows\" width=\"960\" height=\"450\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Mo-Command-Prompt-Windows.jpg 960w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Mo-Command-Prompt-Windows-300x141.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Mo-Command-Prompt-Windows-768x360.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Mo-Command-Prompt-Windows-750x352.jpg 750w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><figcaption id=\"caption-attachment-22081\" class=\"wp-caption-text\">M\u1edf Command Prompt &#8211; Windows<\/figcaption><\/figure>\r\n<p><strong>B\u01b0\u1edbc 2:<\/strong> Nh\u1eadp\u00a0 <strong><em>&#8220;ipconfig \/flushdns&#8221;<\/em><\/strong> v\u00e0 b\u1ea5m<strong> Enter<\/strong>.<\/p>\r\n<figure id=\"attachment_22082\" aria-describedby=\"caption-attachment-22082\" style=\"width: 960px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-22082\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Nhap-lenh-Command-Prompt.jpg\" alt=\"Nh\u1eadp l\u1ec7nh Command Prompt\" width=\"960\" height=\"450\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Nhap-lenh-Command-Prompt.jpg 960w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Nhap-lenh-Command-Prompt-300x141.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Nhap-lenh-Command-Prompt-768x360.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Nhap-lenh-Command-Prompt-750x352.jpg 750w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><figcaption id=\"caption-attachment-22082\" class=\"wp-caption-text\">Nh\u1eadp l\u1ec7nh Command Prompt<\/figcaption><\/figure>\r\n<h4 class=\"wp-block-heading\">7.2 X\u00f3a cache DNS tr\u00ean m\u00e1y MacOS<\/h4>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n<p><strong>B\u01b0\u1edbc 1:<\/strong> M\u1edf Terminal b\u1eb1ng c\u00e1ch <strong>nh\u1ea5n t\u1ed5 h\u1ee3p Command + Space<\/strong> ho\u1eb7c t\u00ecm ki\u1ebfm<strong><em>&#8220;Terminal&#8221;<\/em><\/strong>.<\/p>\r\n<figure id=\"attachment_22083\" aria-describedby=\"caption-attachment-22083\" style=\"width: 960px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-22083\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Mo-Terminal-MacOS.jpg\" alt=\"M\u1edf Terminal - MacOS\" width=\"960\" height=\"450\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Mo-Terminal-MacOS.jpg 960w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Mo-Terminal-MacOS-300x141.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Mo-Terminal-MacOS-768x360.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Mo-Terminal-MacOS-750x352.jpg 750w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><figcaption id=\"caption-attachment-22083\" class=\"wp-caption-text\">M\u1edf Terminal &#8211; MacOS<\/figcaption><\/figure>\r\n<p><strong>B\u01b0\u1edbc 2:<\/strong> \u0110i\u1ec1n m\u00e3 <strong><em>&#8220;sudo dscacheutil \u2013flushcache&#8221;<\/em>.<\/strong><\/p>\r\n<figure id=\"attachment_22084\" aria-describedby=\"caption-attachment-22084\" style=\"width: 960px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-22084\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Nhap-lenh-Terminal.jpg\" alt=\"Nh\u1eadp l\u1ec7nh Terminal\" width=\"960\" height=\"450\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Nhap-lenh-Terminal.jpg 960w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Nhap-lenh-Terminal-300x141.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Nhap-lenh-Terminal-768x360.jpg 768w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2024\/12\/Nhap-lenh-Terminal-750x352.jpg 750w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><figcaption id=\"caption-attachment-22084\" class=\"wp-caption-text\">Nh\u1eadp l\u1ec7nh Terminal<\/figcaption><\/figure>\r\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"8-Kiem-tra-Extension\"><\/span>8. Ki\u1ec3m tra Extension<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>Extension l\u00e0 nh\u1eefng ti\u1ec7n \u00edch m\u1edf r\u1ed9ng ch\u1ee9c n\u0103ng c\u1ee7a tr\u00ecnh duy\u1ec7t. Tuy nhi\u00ean, ch\u00fang c\u0169ng c\u00f3 th\u1ec3 g\u00e2y ra xung \u0111\u1ed9t ho\u1eb7c l\u1ed7i khi b\u1ea1n truy c\u1eadp v\u00e0o c\u00e1c trang web. B\u1ea1n c\u00f3 th\u1ec3 ki\u1ec3m tra extension c\u1ee7a tr\u00ecnh duy\u1ec7t b\u1eb1ng c\u00e1ch v\u00e0o menu<strong> C\u00e0i \u0111\u1eb7t c\u1ee7a tr\u00ecnh duy\u1ec7t<\/strong> <strong>&gt;<\/strong> ch\u1ecdn <strong>Extension<\/strong> <em>(Ti\u1ec7n \u00edch m\u1edf r\u1ed9ng)<\/em> v\u00e0<strong> t\u1eaft<\/strong> ho\u1eb7c <strong>g\u1ee1 b\u1ecf<\/strong> <strong>nh\u1eefng extension nghi ng\u1edd ho\u1eb7c kh\u00f4ng c\u1ea7n thi\u1ebft.<\/strong><\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"9-Su-dung-trinh-duyet-o-che-do-Safe-Mode\"><\/span>9. S\u1eed d\u1ee5ng tr\u00ecnh duy\u1ec7t \u1edf ch\u1ebf \u0111\u1ed9 Safe Mode<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n<p><strong>Ch\u1ebf \u0111\u1ed9 Safe Mode<\/strong> l\u00e0 m\u1ed9t ch\u1ebf \u0111\u1ed9 cho ph\u00e9p b\u1ea1n s\u1eed d\u1ee5ng tr\u00ecnh duy\u1ec7t m\u00e0 kh\u00f4ng c\u00f3 b\u1ea5t k\u1ef3 plugins, extension, theme ho\u1eb7c c\u00e0i \u0111\u1eb7t n\u00e0o \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ho\u1ea1t \u0111\u1ed9ng c\u1ee7a tr\u00ecnh duy\u1ec7t.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>\u0110\u1ec3 kh\u1eafc ph\u1ee5c l\u1ed7i 502, b\u1ea1n c\u00f3 th\u1ec3 th\u1eed <strong>ch\u1ea1y tr\u00ecnh duy\u1ec7t \u1edf ch\u1ebf \u0111\u1ed9 \u1ea9n danh<\/strong> <em>(Safe Mode)<\/em>. Khi ch\u1ea1y \u1edf ch\u1ebf \u0111\u1ed9 n\u00e0y, tr\u00ecnh duy\u1ec7t s\u1ebd s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft l\u1eadp m\u1eb7c \u0111\u1ecbnh v\u00e0 kh\u00f4ng c\u00f3 toolbar, ti\u1ec7n \u00edch m\u1edf r\u1ed9ng hay add-on n\u00e0o. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 gi\u00fap b\u1ea1n truy c\u1eadp trang web m\u00e0 kh\u00f4ng b\u1ecb l\u1ed7i 502 Bad Gateway.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"10-Kiem-tra-Error-Log\"><\/span>10. Ki\u1ec3m tra Error Log<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>\u0110\u1ec3 kh\u1eafc ph\u1ee5c l\u1ed7i 502 Bad Gateway, b\u1ea1n c\u1ea7n <strong>xem l\u1ea1i Error Log \u0111\u1ec3 t\u00ecm ra v\u1ea5n \u0111\u1ec1 \u0111\u1ebfn t\u1eeb \u0111\u00e2u<\/strong>. N\u1ebfu website c\u1ee7a b\u1ea1n d\u1ef1a tr\u00ean WordPress, b\u1ea1n c\u00f3 th\u1ec3 b\u1eadt Error Logging b\u1eb1ng c\u00e1ch th\u00eam \u0111o\u1ea1n code sau v\u00e0o file<strong> wp-config.php<\/strong>:<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:code -->\r\n<pre class=\"wp-block-code\"><code>define( \u2018WP_DEBUG\u2019, true );<\/code><\/pre>\r\n<!-- \/wp:code -->\r\n\r\n<!-- wp:code -->\r\n<pre class=\"wp-block-code\"><code>define( \u2018WP_DEBUG_LOG\u2019, true );<\/code><\/pre>\r\n<!-- \/wp:code -->\r\n\r\n<!-- wp:code -->\r\n<pre class=\"wp-block-code\"><code>define( \u2018WP_DEBUG_DISPLAY\u2019, false );<\/code><\/pre>\r\n<!-- \/wp:code -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>Sau \u0111\u00f3, b\u1ea1n c\u00f3 th\u1ec3 xem c\u00e1c l\u1ed7i \u0111\u01b0\u1ee3c ghi l\u1ea1i trong ph\u1ea7n <strong>wp-contents\/debug.log<\/strong>.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"11-Kiem-tra-CDNs\"><\/span>11. Ki\u1ec3m tra CDNs<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n<p><strong>CDNs <\/strong>ho\u1eb7c <strong>DDoS Mitigation Servers<\/strong> c\u00f3 th\u1ec3 g\u00e2y ra l\u1ed7i 502 Bad Gateway khi c\u00f3 xung \u0111\u1ed9t gi\u1eefa c\u00e1c phi\u00ean b\u1ea3n. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft trong v\u00e0i gi\u1edd. B\u1ea1n n\u00ean li\u00ean h\u1ec7 v\u1edbi nh\u00e0 cung c\u1ea5p hosting \u0111\u1ec3 \u0111\u01b0\u1ee3c h\u01b0\u1edbng d\u1eabn c\u1ee5 th\u1ec3.<\/p>\r\n<!-- \/wp:paragraph -->\r\n\r\n<!-- wp:heading {\"level\":3} -->\r\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"12-Lien-he-voi-quan-tri-vien-trang-web\"><\/span>12. Li\u00ean h\u1ec7 v\u1edbi qu\u1ea3n tr\u1ecb vi\u00ean trang web<span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<!-- \/wp:heading -->\r\n\r\n<!-- wp:paragraph -->\r\n<p>N\u1ebfu b\u1ea1n \u0111\u00e3 th\u1eed h\u1ebft 10 c\u00e1ch tr\u00ean m\u00e0 website v\u1eabn hi\u1ec3n th\u1ecb l\u1ed7i 502 Bad Gateway, b\u1ea1n n\u00ean li\u00ean h\u1ec7 v\u1edbi qu\u1ea3n tr\u1ecb vi\u00ean website \u0111\u1ec3 \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 v\u00e0 h\u01b0\u1edbng d\u1eabn c\u00e1ch x\u1eed l\u00fd v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/p>\r\n<h2><span class=\"ez-toc-section\" id=\"Loi-502-khac-gi-so-voi-loi-500-503-va-504\"><\/span>L\u1ed7i 502 kh\u00e1c g\u00ec so v\u1edbi l\u1ed7i 500, 503 v\u00e0 504?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n<p>T\u1ea5t c\u1ea3 c\u00e1c l\u1ed7i c\u00f3 m\u00e3 b\u1eaft \u0111\u1ea7u b\u1eb1ng s\u1ed1 &#8220;5&#8221; (5xx) \u0111\u1ec1u cho th\u1ea5y s\u1ef1 c\u1ed1 x\u1ea3y ra \u1edf ph\u00eda m\u00e1y ch\u1ee7 (server), kh\u00f4ng ph\u1ea3i do m\u00e1y t\u00ednh hay m\u1ea1ng c\u1ee7a b\u1ea1n. Tuy nhi\u00ean, m\u1ed7i m\u00e3 l\u1ed7i l\u1ea1i ch\u1ec9 ra m\u1ed9t v\u1ea5n \u0111\u1ec1 ho\u00e0n to\u00e0n kh\u00e1c nhau.<\/p>\r\n<p>\u0110\u1ec3 d\u1ec5 h\u00ecnh dung, h\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng b\u1ea1n l\u00e0 m\u1ed9t kh\u00e1ch h\u00e0ng (tr\u00ecnh duy\u1ec7t) v\u00e0 trang web l\u00e0 m\u1ed9t nh\u00e0 h\u00e0ng l\u1edbn.<\/p>\r\n<ul>\r\n<li>\r\n<p><strong>Ng\u01b0\u1eddi ph\u1ee5c v\u1ee5<\/strong> l\u00e0 <strong>m\u00e1y ch\u1ee7 gateway\/proxy<\/strong> (m\u00e1y ch\u1ee7 trung gian nh\u1eadn y\u00eau c\u1ea7u \u0111\u1ea7u ti\u00ean).<\/p>\r\n<\/li>\r\n<li>\r\n<p><strong>Nh\u00e0 b\u1ebfp<\/strong> l\u00e0 <strong>m\u00e1y ch\u1ee7 g\u1ed1c<\/strong> (n\u01a1i x\u1eed l\u00fd y\u00eau c\u1ea7u v\u00e0 ch\u1ee9a d\u1eef li\u1ec7u).<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 s\u1ef1 kh\u00e1c bi\u1ec7t c\u1ee7a t\u1eebng l\u1ed7i trong b\u1ed1i c\u1ea3nh nh\u00e0 h\u00e0ng n\u00e0y:<\/p>\r\n<h3><span class=\"ez-toc-section\" id=\"Loi-502-Bad-Gateway\"><\/span><strong>L\u1ed7i 502 (Bad Gateway)\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<ul>\r\n<li>\r\n<p><strong>T\u00ecnh hu\u1ed1ng:<\/strong> Ng\u01b0\u1eddi ph\u1ee5c v\u1ee5 nh\u1eadn y\u00eau c\u1ea7u c\u1ee7a b\u1ea1n v\u00e0 \u0111i v\u00e0o nh\u00e0 b\u1ebfp. Nh\u00e0 b\u1ebfp tr\u1ea3 l\u1eddi l\u1ea1i nh\u01b0ng b\u1eb1ng m\u1ed9t ng\u00f4n ng\u1eef kh\u00f3 hi\u1ec3u ho\u1eb7c \u0111\u01b0a ra m\u1ed9t m\u00f3n \u0103n sai ho\u00e0n to\u00e0n. Ng\u01b0\u1eddi ph\u1ee5c v\u1ee5 kh\u00f4ng hi\u1ec3u nh\u00e0 b\u1ebfp \u0111ang l\u00e0m g\u00ec v\u00e0 kh\u00f4ng th\u1ec3 mang m\u00f3n \u0103n \u0111\u00fang ra cho b\u1ea1n.<\/p>\r\n<\/li>\r\n<li>\r\n<p><strong>B\u1ea3n ch\u1ea5t:<\/strong> L\u1ed7i 502 x\u1ea3y ra khi <strong>m\u00e1y ch\u1ee7 gateway nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t ph\u1ea3n h\u1ed3i kh\u00f4ng h\u1ee3p l\u1ec7<\/strong> t\u1eeb m\u00e1y ch\u1ee7 g\u1ed1c. C\u00f3 s\u1ef1 giao ti\u1ebfp, nh\u01b0ng n\u1ed9i dung giao ti\u1ebfp \u0111\u00f3 b\u1ecb l\u1ed7i ho\u1eb7c v\u00f4 ngh\u0129a.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3><span class=\"ez-toc-section\" id=\"Loi-500-Internal-Server-Error\"><\/span><strong>L\u1ed7i 500 (Internal Server Error)\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<ul>\r\n<li>\r\n<p><strong>T\u00ecnh hu\u1ed1ng:<\/strong> Ng\u01b0\u1eddi ph\u1ee5c v\u1ee5 nh\u1eadn y\u00eau c\u1ea7u c\u1ee7a b\u1ea1n v\u00e0 \u0111i v\u00e0o nh\u00e0 b\u1ebfp. B\u1ea5t ng\u1edd, b\u1ea1n nghe th\u1ea5y ti\u1ebfng xoong n\u1ed3i r\u01a1i v\u1ee1 v\u00e0 h\u1ed7n lo\u1ea1n t\u1eeb b\u00ean trong. Nh\u00e0 b\u1ebfp \u0111ang c\u00f3 m\u1ed9t s\u1ef1 c\u1ed1 n\u1ed9i b\u1ed9 (v\u00ed d\u1ee5: \u0111\u1ea7u b\u1ebfp tr\u01b0\u1ee3t ch\u00e2n) v\u00e0 kh\u00f4ng th\u1ec3 n\u1ea5u b\u1ea5t k\u1ef3 m\u00f3n n\u00e0o.<\/p>\r\n<\/li>\r\n<li>\r\n<p><strong>B\u1ea3n ch\u1ea5t:<\/strong> L\u1ed7i 500 l\u00e0 m\u1ed9t l\u1ed7i <strong>chung chung, kh\u00f4ng x\u00e1c \u0111\u1ecbnh<\/strong>, x\u1ea3y ra <strong>b\u00ean trong ch\u00ednh m\u00e1y ch\u1ee7 g\u1ed1c<\/strong>. M\u00e1y ch\u1ee7 bi\u1ebft c\u00f3 g\u00ec \u0111\u00f3 sai nh\u01b0ng kh\u00f4ng th\u1ec3 ch\u1ec9 r\u00f5 l\u00e0 sai \u1edf \u0111\u00e2u.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3><span class=\"ez-toc-section\" id=\"Loi-503-Service-Unavailable\"><\/span><strong>L\u1ed7i 503 (Service Unavailable)\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<ul>\r\n<li>\r\n<p><strong>T\u00ecnh hu\u1ed1ng:<\/strong> B\u1ea1n \u0111\u1ebfn c\u1eeda nh\u00e0 h\u00e0ng v\u00e0 th\u1ea5y m\u1ed9t t\u1ea5m bi\u1ec3n &#8220;Qu\u00e1 \u0111\u00f4ng kh\u00e1ch, vui l\u00f2ng quay l\u1ea1i sau 30 ph\u00fat&#8221; ho\u1eb7c &#8220;T\u1ea1m ngh\u1ec9 \u0111\u1ec3 d\u1ecdn d\u1eb9p&#8221;. Nh\u00e0 h\u00e0ng v\u1eabn \u1edf \u0111\u00f3, kh\u00f4ng b\u1ecb h\u1ecfng h\u00f3c g\u00ec, nh\u01b0ng h\u1ecd <strong>ch\u1ee7 \u0111\u1ed9ng t\u1ea1m ng\u1eebng ph\u1ee5c v\u1ee5<\/strong>.<\/p>\r\n<\/li>\r\n<li>\r\n<p><strong>B\u1ea3n ch\u1ea5t:<\/strong> L\u1ed7i 503 x\u1ea3y ra khi m\u00e1y ch\u1ee7 <strong>t\u1ea1m th\u1eddi kh\u00f4ng th\u1ec3 x\u1eed l\u00fd y\u00eau c\u1ea7u<\/strong>, th\u01b0\u1eddng l\u00e0 do \u0111ang <strong>b\u1ea3o tr\u00ec<\/strong> ho\u1eb7c b\u1ecb <strong>qu\u00e1 t\u1ea3i<\/strong> v\u00ec c\u00f3 qu\u00e1 nhi\u1ec1u y\u00eau c\u1ea7u c\u00f9ng l\u00fac.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<h3><span class=\"ez-toc-section\" id=\"Loi-504-Gateway-Timeout\"><\/span><strong>L\u1ed7i 504 (Gateway Timeout)\u00a0<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\r\n<ul>\r\n<li>\r\n<p><strong>T\u00ecnh hu\u1ed1ng:<\/strong> Ng\u01b0\u1eddi ph\u1ee5c v\u1ee5 nh\u1eadn y\u00eau c\u1ea7u c\u1ee7a b\u1ea1n, \u0111i v\u00e0o nh\u00e0 b\u1ebfp v\u00e0 ch\u1edd \u0111\u1ee3i. H\u1ecd ch\u1edd r\u1ea5t l\u00e2u&#8230; nh\u01b0ng nh\u00e0 b\u1ebfp kh\u00f4ng h\u1ec1 \u0111\u01b0a m\u00f3n \u0103n ra. H\u1ebft th\u1eddi gian ch\u1edd \u0111\u1ee3i cho ph\u00e9p, ng\u01b0\u1eddi ph\u1ee5c v\u1ee5 \u0111\u00e0nh ph\u1ea3i quay l\u1ea1i b\u00e0n v\u00e0 n\u00f3i &#8220;Xin l\u1ed7i, nh\u00e0 b\u1ebfp \u0111\u00e3 kh\u00f4ng ph\u1ea3n h\u1ed3i k\u1ecbp th\u1eddi&#8221;.<\/p>\r\n<\/li>\r\n<li>\r\n<p><strong>B\u1ea3n ch\u1ea5t:<\/strong> L\u1ed7i 504 x\u1ea3y ra khi <strong>m\u00e1y ch\u1ee7 gateway kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c ph\u1ea3n h\u1ed3i<\/strong> t\u1eeb m\u00e1y ch\u1ee7 g\u1ed1c trong m\u1ed9t kho\u1ea3ng th\u1eddi gian quy \u0111\u1ecbnh. V\u1ea5n \u0111\u1ec1 kh\u00f4ng ph\u1ea3i l\u00e0 ph\u1ea3n h\u1ed3i sai (nh\u01b0 502), m\u00e0 l\u00e0 ho\u00e0n to\u00e0n kh\u00f4ng c\u00f3 ph\u1ea3n h\u1ed3i.<\/p>\r\n<\/li>\r\n<\/ul>\r\n<p>Hy v\u1ecdng b\u00e0i vi\u1ebft n\u00e0y c\u1ee7a <strong><a href=\"https:\/\/interdata.vn\/\">InterData<\/a><\/strong>, b\u1ea1n hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 l\u1ed7i 502 Bad Gateway l\u00e0 g\u00ec, nguy\u00ean nh\u00e2n v\u00e0 c\u00e1ch s\u1eeda l\u1ed7i 502 Bad Gateway hi\u1ec7u qu\u1ea3. Ch\u00fac b\u1ea1n kh\u1eafc ph\u1ee5c <strong>l\u1ed7i 504 Bad Gateway<\/strong> th\u00e0nh c\u00f4ng! \u00a0<\/p>","protected":false},"excerpt":{"rendered":"<p>L\u1ed7i 502 Bad Gateway l\u00e0 m\u1ed9t trong nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn khi truy c\u1eadp c\u00e1c trang web, khi\u1ebfn ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng th\u1ec3 k\u1ebft n\u1ed1i \u0111\u1ebfn n\u1ed9i dung h\u1ecd c\u1ea7n. L\u1ed7i kh\u00f4ng ch\u1ec9 g\u00e2y phi\u1ec1n to\u00e1i cho ng\u01b0\u1eddi d\u00f9ng m\u00e0 c\u00f2n \u1ea3nh h\u01b0\u1edfng nghi\u00eam tr\u1ecdng \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a website, \u0111\u1eb7c bi\u1ec7t trong l\u0129nh v\u1ef1c SEO.<\/p>\n","protected":false},"author":11,"featured_media":34848,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-22079","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hosting"],"_links":{"self":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/22079","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/comments?post=22079"}],"version-history":[{"count":1,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/22079\/revisions"}],"predecessor-version":[{"id":34840,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/22079\/revisions\/34840"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media\/34848"}],"wp:attachment":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media?parent=22079"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/categories?post=22079"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/tags?post=22079"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}