{"id":108297,"date":"2026-08-22T20:21:57","date_gmt":"2026-08-22T14:51:57","guid":{"rendered":"https:\/\/seminarsonly.com\/news\/?p=108297"},"modified":"2026-08-22T20:43:35","modified_gmt":"2026-08-22T15:13:35","slug":"fix-web-server-unknown-error-code-520-cloudflare","status":"publish","type":"post","link":"https:\/\/seminarsonly.com\/news\/fix-web-server-unknown-error-code-520-cloudflare\/","title":{"rendered":"How to Fix &#8220;Web Server is Returning an Unknown Error (Error Code 520)&#8221;"},"content":{"rendered":"<article style=\"max-width: 100%; box-sizing: border-box; font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; line-height: 1.7; color: #1f2937; padding: 10px;\"><!-- Hero \/ Featured Image --><\/p>\n<header style=\"margin-bottom: 25px;\"><img decoding=\"async\" style=\"max-width: 100%; height: auto; display: block; border-radius: 8px;\" src=\"https:\/\/placehold.co\/1200x675\/1e3a8a\/ffffff.jpeg?text=Fix+Error+Code+520:+Web+Server+Unknown+Error\" alt=\"Illustration of Error Code 520 Web Server is Returning an Unknown Error\" width=\"1200\" height=\"675\" \/><\/header>\n<p><!-- Quick Answer Box --><\/p>\n<section style=\"background-color: #f0fdf4; border-left: 6px solid #16a34a; padding: 22px; margin-bottom: 35px; border-radius: 6px; box-shadow: 0 2px 4px rgba(0,0,0,0.05);\" role=\"region\" aria-label=\"Quick Answer Summary\">\n<h2 style=\"color: #15803d; font-size: 1.35em; margin-top: 0; margin-bottom: 12px;\">Quick Answer<\/h2>\n<p style=\"margin: 0; font-size: 1.05em;\">The <strong>&#8220;Web server is returning an unknown error (Error Code 520)&#8221;<\/strong> is a Cloudflare-specific response indicating that your origin server returned an empty, unknown, or unexpected response to Cloudflare. To fix it immediately: <strong>Check your origin server&#8217;s error logs, ensure your web server hasn&#8217;t crashed, disable overly restrictive firewall rules that might be blocking Cloudflare&#8217;s IP addresses, and verify that your HTTP response headers are not exceeding the 8KB limit.<\/strong><\/p>\n<\/section>\n<p><!-- H2 Main Heading --><\/p>\n<h2 style=\"color: #2563eb; border-bottom: 2px solid #93c5fd; padding-bottom: 8px; margin-top: 40px; font-size: 1.8em;\">Understanding the 520 Error: The Cloudflare Handshake<\/h2>\n<p>When you use a reverse proxy or Content Delivery Network (CDN) like Cloudflare, your website sits behind a protective shield. When a visitor types in your URL, their browser connects to Cloudflare, and Cloudflare acts as the middleman, pulling the data from your actual hosting provider (the &#8220;origin server&#8221;).<\/p>\n<p><strong>Error Code 520<\/strong> acts as a &#8220;catch-all&#8221; error. It means Cloudflare reached out to your origin server, but the server responded in a way that violated standard HTTP protocols. Because Cloudflare doesn&#8217;t know how to interpret the broken response, it throws the 520 error to the end user.<\/p>\n<p><!-- H2 Main Heading --><\/p>\n<h2 style=\"color: #7c3aed; border-bottom: 2px solid #c4b5fd; padding-bottom: 8px; margin-top: 40px; font-size: 1.8em;\">Primary Causes Behind Error Code 520<\/h2>\n<ul style=\"margin-bottom: 25px; padding-left: 20px;\">\n<li style=\"margin-bottom: 10px;\"><strong>Connection Resets:<\/strong> The origin server abruptly drops the TCP connection after the initial handshake.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Header Size Limits:<\/strong> Your server is generating HTTP headers that exceed Cloudflare&#8217;s strict 8KB (8,192 bytes) size limit. This frequently happens with bloated cookies.<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>Empty Responses:<\/strong> The origin server returns an empty string instead of a valid HTTP status code (like 200 OK or 404 Not Found).<\/li>\n<li style=\"margin-bottom: 10px;\"><strong>IP Blocking:<\/strong> Your host&#8217;s security firewall or ModSecurity rules are mistakenly blacklisting Cloudflare&#8217;s connecting IP addresses.<\/li>\n<\/ul>\n<blockquote class=\"wp-embedded-content\" data-secret=\"kKtnQacQC4\"><p><a href=\"https:\/\/seminarsonly.com\/news\/is-torbox-down-server-status\/\">Is TorBox Down? Check Server Status, Outages &#038; Quick Fixes<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u201cIs TorBox Down? Check Server Status, Outages &amp; Quick Fixes\u201d \u2014 Seminarsonly.com\" src=\"https:\/\/seminarsonly.com\/news\/is-torbox-down-server-status\/embed\/#?secret=YXyW2oslUD#?secret=kKtnQacQC4\" data-secret=\"kKtnQacQC4\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<p><!-- Colored Table --><\/p>\n<h3 style=\"color: #0d9488; margin-top: 35px; font-size: 1.7em;\">Diagnostic Matrix: Fixing the 520 Error<\/h3>\n<p>Use this diagnostic table to isolate your specific backend issue and apply the correct server-side fix:<\/p>\n<div style=\"overflow-x: auto;\">\n<table style=\"border-collapse: collapse; width: 100%; margin: 15px 0; font-size: 0.95em; box-shadow: 0 2px 5px rgba(0,0,0,0.1);\" aria-label=\"Diagnostic matrix for troubleshooting Error Code 520\">\n<thead>\n<tr style=\"background-color: #374151; color: #ffffff; text-align: left;\">\n<th style=\"padding: 14px; border: 1px solid #1f2937;\" scope=\"col\">Origin Server Symptom<\/th>\n<th style=\"padding: 14px; border: 1px solid #1f2937;\" scope=\"col\">Underlying Cause<\/th>\n<th style=\"padding: 14px; border: 1px solid #1f2937;\" scope=\"col\">Required Action<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color: #f3f4f6;\">\n<td style=\"padding: 14px; border: 1px solid #d1d5db;\"><strong>PHP fatal errors in Apache\/Nginx logs<\/strong><\/td>\n<td style=\"padding: 14px; border: 1px solid #d1d5db;\">A broken plugin\/script is crashing the response.<\/td>\n<td style=\"padding: 14px; border: 1px solid #d1d5db;\">Disable recent plugins and check <code>error_log<\/code> for the exact broken script.<\/td>\n<\/tr>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 14px; border: 1px solid #d1d5db;\"><strong>Connections blocked at firewall level<\/strong><\/td>\n<td style=\"padding: 14px; border: 1px solid #d1d5db;\">Host is rate-limiting Cloudflare IPs.<\/td>\n<td style=\"padding: 14px; border: 1px solid #d1d5db;\">Whitelist all official Cloudflare IPv4\/IPv6 ranges in your server firewall.<\/td>\n<\/tr>\n<tr style=\"background-color: #f3f4f6;\">\n<td style=\"padding: 14px; border: 1px solid #d1d5db;\"><strong>520 error only on POST requests (logins\/carts)<\/strong><\/td>\n<td style=\"padding: 14px; border: 1px solid #d1d5db;\">HTTP Headers exceed 8KB size limit.<\/td>\n<td style=\"padding: 14px; border: 1px solid #d1d5db;\">Clear browser cookies, reduce cookie generation in your web application.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><!-- TLDR Box --><\/p>\n<section style=\"background-color: #fffbeb; border-left: 6px solid #f59e0b; padding: 22px; margin-top: 40px; border-radius: 6px; box-shadow: 0 2px 4px rgba(0,0,0,0.05);\" role=\"region\" aria-label=\"TLDR Summary\">\n<h2 style=\"color: #b45309; font-size: 1.35em; margin-top: 0; margin-bottom: 12px;\">TL;DR: The 520 Error Checklist<\/h2>\n<ul style=\"margin: 0; padding-left: 20px; font-size: 1.05em; color: #92400e;\">\n<li style=\"margin-bottom: 8px;\"><strong>It is a Host Issue:<\/strong> Cloudflare is working perfectly; your actual origin server is the one returning a bad response.<\/li>\n<li style=\"margin-bottom: 8px;\"><strong>Check Firewalls:<\/strong> Ensure your hosting provider has whitelisted all Cloudflare IP addresses.<\/li>\n<li style=\"margin-bottom: 8px;\"><strong>Review Logs:<\/strong> Check your Apache\/Nginx error logs for PHP crashes or database timeouts happening at the exact time of the error.<\/li>\n<li style=\"margin-bottom: 8px;\"><strong>Pause Cloudflare:<\/strong> Temporarily pause Cloudflare in your dashboard to see if your site loads directly from the server. If it throws a 500 Internal Server Error, you have found the root cause.<\/li>\n<li><strong>Header Size:<\/strong> Ensure you aren&#8217;t storing too much data in cookies, which causes headers to exceed 8KB.<\/li>\n<\/ul>\n<\/section>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>Quick Answer The &#8220;Web server is returning an unknown error (Error Code 520)&#8221; is a Cloudflare-specific response indicating that your origin server returned an empty, unknown, or unexpected response to&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"wpai_generated_summary":"","footnotes":""},"categories":[6048],"tags":[8638,8637,8639,8636],"class_list":["post-108297","post","type-post","status-publish","format-standard","hentry","category-error-fix","tag-520-web-server-returning-unknown-error","tag-cloudflare-error-520-fix","tag-troubleshoot-520-error-cloudflare","tag-web-server-is-returning-an-unknown-error"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.3 (Yoast SEO v28.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How to Fix &quot;Web Server is Returning an Unknown Error (Error Code 520)&quot; - Seminarsonly.com<\/title>\n<meta name=\"description\" content=\"Getting the &quot;Web server is returning an unknown error (Error Code 520)&quot; message? 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