{"id":6088,"date":"2025-05-10T13:03:23","date_gmt":"2025-05-10T13:03:23","guid":{"rendered":"https:\/\/www.kaashivinfotech.com\/blog\/?p=6088"},"modified":"2025-07-21T11:44:52","modified_gmt":"2025-07-21T11:44:52","slug":"error-520-everything-you-need-to-know","status":"publish","type":"post","link":"https:\/\/www.kaashivinfotech.com\/blog\/error-520-everything-you-need-to-know\/","title":{"rendered":"Error 520: What It Means, Why It Happens, and How to Fix It (Cloudflare Guide + Real Solutions \ud83d\udd27)"},"content":{"rendered":"\r\n<p><strong data-start=\"494\" data-end=\"568\">Stuck with a Cloudflare Error 520 and not sure where it\u2019s coming from?<\/strong> This in-depth guide breaks down what Error 520 actually means, the most common server-side causes (like bad headers or firewall blocks), and how to troubleshoot it with easy-to-follow solutions. Whether you&#8217;re a developer, blogger, or website owner, you&#8217;ll find real-world fixes, tips, and examples to resolve this frustrating issue quickly \u2014 and stop it from coming back.<\/p>\r\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\r\n\r\n\r\n<h2 class=\"wp-block-heading\">\ud83d\udd0d <strong>Key Highlights<\/strong><\/h2>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Error 520<\/strong> usually pops up when Cloudflare can&#8217;t reach your origin server properly.<\/li>\r\n\r\n\r\n\r\n<li>It&#8217;s not your browser&#8217;s fault. It\u2019s typically a <strong>server-side problem<\/strong>.<\/li>\r\n\r\n\r\n\r\n<li>Learn <strong>why it happens<\/strong>, how to <strong>diagnose it step-by-step<\/strong>, and what <strong>real developers have done<\/strong> to fix it.<\/li>\r\n\r\n\r\n\r\n<li>Includes <strong>real-life cases<\/strong>, proven solutions, and quick-fix suggestions.<\/li>\r\n\r\n\r\n\r\n<li>Packed with <strong>Cloudflare-specific tips<\/strong> and common causes.<\/li>\r\n\r\n\r\n\r\n<li>Internal and external <strong>resources linked<\/strong> to dive deeper.<\/li>\r\n<\/ul>\r\n\r\n\r\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\r\n\r\n\r\n<h2 class=\"wp-block-heading\">\ud83d\ude4b\u200d\u2642\ufe0f So, What Is Error 520?<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Let\u2019s not sugarcoat it \u2014 seeing <strong>&#8220;Error 520: Web server is returning an unknown error&#8221;<\/strong> when you visit your site is <em>annoying<\/em>, especially when you&#8217;re not sure who to blame \u2014 your hosting provider or Cloudflare?<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">This particular beast is known as the <strong>Cloudflare error 520<\/strong>, and it\u2019s basically Cloudflare throwing up its hands and saying: \u201cHey, I tried to talk to your server, but it gave me a weird response I don\u2019t understand.\u201d<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">But here&#8217;s the good news \u2014 it&#8217;s fixable. And if you stick around, you\u2019ll walk away knowing <strong>exactly how to resolve 520 error<\/strong> messages like a pro.<\/p>\r\n\r\n\r\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\r\n\r\n\r\n<h2 class=\"wp-block-heading\">\ud83e\udde0 <strong>What Causes Error 520?<\/strong><\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">If you\u2019re here, chances are you\u2019ve seen that dreaded white page with a big &#8220;520&#8221; on it. Cloudflare shows this when:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Your <strong>origin server crashes<\/strong> or restarts unexpectedly.<\/li>\r\n\r\n\r\n\r\n<li>There are <strong>empty or malformed HTTP headers<\/strong> from your server.<\/li>\r\n\r\n\r\n\r\n<li>Your hosting provider\u2019s firewall or <strong>mod_security<\/strong> blocks Cloudflare\u2019s IPs.<\/li>\r\n\r\n\r\n\r\n<li>There\u2019s a misconfigured <strong>SSL setting<\/strong> on either side.<\/li>\r\n\r\n\r\n\r\n<li>Cloudflare\u2019s IPs are <strong>rate-limited or blocked<\/strong>.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Let\u2019s look at it visually:<\/p>\r\n\r\n\r\n\r\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><strong>Cloudflare \u27a1 Origin Server<\/strong> \u201cHey, give me that page for the visitor!\u201d <strong>Origin Server:<\/strong> \u201cUmm&#8230; [sends garbage or nothing]\u201d <strong>Cloudflare:<\/strong> \u201cError 520 \u2014 I have no idea what this is.\u201d <\/blockquote>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\ud83d\udccc Real example:<\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Rohit, who runs a WordPress blog on shared hosting, noticed a 520 error showing up every few hours. After digging around, it turned out his server\u2019s <strong>PHP-FPM process was crashing intermittently<\/strong>. Fixing that solved the issue. No fancy tools needed \u2014 just a bit of observation and logs.<\/p>\r\n\r\n\r\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\r\n\r\n\r\n<h2 class=\"wp-block-heading\">\u2699\ufe0f How to Fix Error 520 (Step-by-Step \ud83d\udee0\ufe0f)<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Here\u2019s the part you came for: real-world, actionable fixes.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\u2705 1. <strong>Check Your Server Logs<\/strong><\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Most <strong>520 web server errors<\/strong> are due to your server, not Cloudflare. Look inside:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><code class=\"\" data-line=\"\">\/var\/log\/apache2\/error.log<\/code><\/li>\r\n\r\n\r\n\r\n<li><code class=\"\" data-line=\"\">\/var\/log\/nginx\/error.log<\/code><\/li>\r\n\r\n\r\n\r\n<li>Hosting panel logs (like cPanel, Plesk)<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Look for clues like: \u201cConnection refused\u201d\u2757 \u201cBad header\u201d\u2757 \u201cSegfault\u201d or crash info\u2757<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\u2705 2. <strong>Pause Cloudflare Temporarily<\/strong><\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">This helps narrow down the issue.<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Log into Cloudflare<\/li>\r\n\r\n\r\n\r\n<li>Go to your site\u2019s dashboard<\/li>\r\n\r\n\r\n\r\n<li>Scroll down to \u201cAdvanced Actions\u201d<\/li>\r\n\r\n\r\n\r\n<li>Click <strong>Pause Cloudflare on Site<\/strong><\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Now try accessing your site directly. If the issue persists, your origin server is the culprit.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\u2705 3. <strong>Whitelist Cloudflare IPs<\/strong><\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Sometimes your firewall thinks Cloudflare is an attacker (ironic, right?).<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">\u27a1 <a>Here\u2019s Cloudflare\u2019s full IP list<\/a> Add them to your server\u2019s allowlist.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\u2705 4. <strong>Disable .htaccess Rules or ModSecurity<\/strong><\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Overzealous rules in your <code class=\"\" data-line=\"\">.htaccess<\/code> or web application firewall can cause <strong>Cloudflare server connection error<\/strong> problems.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Temporarily disable them and see if the 520 error disappears.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\u2705 5. <strong>Switch SSL\/TLS Mode<\/strong><\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Try toggling between:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><strong>Full<\/strong><\/li>\r\n\r\n\r\n\r\n<li><strong>Full (Strict)<\/strong><\/li>\r\n\r\n\r\n\r\n<li><strong>Flexible<\/strong><\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Sometimes the wrong mode messes up secure connections. Make sure your certificate is valid and your origin server supports HTTPS.<\/p>\r\n\r\n\r\n\r\n<h3 class=\"wp-block-heading\">\u2705 6. <strong>Contact Hosting Support<\/strong><\/h3>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">If you\u2019ve tried the above and still no luck, send this message to your host:<\/p>\r\n\r\n\r\n\r\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\u201cHi, I\u2019m getting a Cloudflare error 520. Could you check if your server is blocking Cloudflare\u2019s IPs or crashing when it receives requests?\u201d <\/blockquote>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">They\u2019ll know what to do. (If they don\u2019t, it might be time to find a better host.)<\/p>\r\n\r\n\r\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\r\n\r\n\r\n<h2 class=\"wp-block-heading\">\ud83e\udd16 Common Myths About Cloudflare Error 520<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>eMyth:<\/strong> It&#8217;s a Cloudflare bug. <strong>Reality:<\/strong> 95% of the time, it&#8217;s a <strong>server-side issue<\/strong> \u2014 bad headers, firewalls, crashes.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Myth:<\/strong> It\u2019s the browser\u2019s fault. <strong>Reality:<\/strong> Browsers don\u2019t even get that far. <strong>Cloudflare hits the wall before the page reaches your browser.<\/strong><\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\"><strong>Myth:<\/strong> Restarting your PC fixes it. <strong>Reality:<\/strong> Nope. You\u2019d have better luck restarting your hosting service.<\/p>\r\n\r\n\r\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\r\n\r\n\r\n<h2 class=\"wp-block-heading\">\ud83e\uddea Technical Breakdown: 520 Status Code Meaning<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Unlike standard HTTP errors like 404 (Not Found) or 500 (Internal Server Error), <strong>520 is unique to Cloudflare<\/strong>.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">It\u2019s used <strong>when Cloudflare receives an unknown error from your origin server<\/strong> \u2014 something that doesn\u2019t map to a typical HTTP status code.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Think of it as a wildcard. Cloudflare says: \u201cI didn\u2019t get a valid HTTP response, just weirdness.\u201d<\/p>\r\n\r\n\r\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\r\n\r\n\r\n<h2 class=\"wp-block-heading\">\ud83e\uddf5 Why Does This Matter for Website Owners?<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Because your visitors don\u2019t wait around. If your site shows <strong>&#8220;Cloudflare error 520&#8221;<\/strong> too often, they bounce \u2014 and Google notices that.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">It hurts:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Your <strong>SEO rankings<\/strong><\/li>\r\n\r\n\r\n\r\n<li>Your <strong>credibility<\/strong><\/li>\r\n\r\n\r\n\r\n<li>Your <strong>conversions<\/strong><\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Knowing how to <strong>fix HTTP 520 error fast<\/strong> saves traffic, sales, and reputation.<\/p>\r\n\r\n\r\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\r\n\r\n\r\n<h2 class=\"wp-block-heading\">\ud83d\udca1 Bonus Tips: Cloudflare 520 Troubleshooting in Action<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Here\u2019s what veteran web admins do:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>Use <strong>Uptime Robot<\/strong> to monitor when 520 errors happen.<\/li>\r\n\r\n\r\n\r\n<li>Combine <strong>Logtail<\/strong> or <strong>Datadog<\/strong> for real-time log analysis.<\/li>\r\n\r\n\r\n\r\n<li>Schedule regular <strong>server reboots<\/strong> if memory leaks are common.<\/li>\r\n\r\n\r\n\r\n<li>Switch to <strong>LiteSpeed or Nginx<\/strong> if Apache crashes often.<\/li>\r\n<\/ul>\r\n\r\n\r\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\r\n\r\n\r\n<h2 class=\"wp-block-heading\">\ud83e\udded Final Thoughts: You\u2019ve Got This<\/h2>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Error 520 may look intimidating, but now you know it\u2019s not some unsolvable mystery.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">It\u2019s usually just:<\/p>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li>A hiccup in your server<\/li>\r\n\r\n\r\n\r\n<li>A miscommunication between Cloudflare and your origin<\/li>\r\n\r\n\r\n\r\n<li>A firewall playing bouncer a bit too hard<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Give your site a bit of TLC, and you\u2019ll bounce back in no time.<\/p>\r\n\r\n\r\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\r\n\r\n\r\n<h2 class=\"wp-block-heading\">\ud83d\udcda Related Reads You Might Find Helpful<\/h2>\r\n\r\n\r\n\r\n<ul class=\"wp-block-list\">\r\n<li><a class=\"\" href=\"https:\/\/www.kaashivinfotech.com\/blog\/%f0%9f%9a%80-how-to-fix-the-401-unauthorized-error-5-easy-solutions\/\"> <strong>How to Fix the 401 Unauthorized Error<\/strong> \u2013 5 Easy Solutions<\/a><\/li>\r\n\r\n\r\n\r\n<li><a class=\"\" href=\"https:\/\/www.kaashivinfotech.com\/blog\/403-forbidden-error-what-it-is-7-easy-fixes-to-regain-access\/\"><strong>403 Forbidden Error<\/strong>: What It Is &amp; 7 Easy Fixes to Regain Access<\/a><\/li>\r\n\r\n\r\n\r\n<li><a class=\"\" href=\"https:\/\/www.kaashivinfotech.com\/blog\/402-error-code-payment-required-heres-what-it-means-how-to-fix-it\/\"><strong>402 Error Code (Payment Required)<\/strong>: Here&#8217;s What It Means &amp; How to Fix It<\/a><\/li>\r\n\r\n\r\n\r\n<li><a class=\"\" href=\"https:\/\/www.kaashivinfotech.com\/blog\/400-bad-request-error-heres-what-it-means-how-to-fix-it\/\"><strong>400 Bad Request Error<\/strong>: Here&#8217;s What It Means &amp; How to Fix It<\/a><\/li>\r\n<li>If you&#8217;re using Laravel, this <a class=\"\" href=\"https:\/\/www.wikitechy.com\/tutorials\/laravel\/laravel-error-handling\" target=\"_new\" rel=\"noopener\" data-start=\"30\" data-end=\"141\">\u00a0guide on Laravel error handling<\/a> can help you trace backend issues that may trigger Error 520.<\/li>\r\n<\/ul>\r\n\r\n\r\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\r\n\r\n\r\n<p class=\"wp-block-paragraph\">If this helped, share it with someone who\u2019s scratching their head over a <strong>Cloudflare 520 error<\/strong>. Or better yet, bookmark it. You never know when that white screen might show up again! \ud83d\ude09<\/p>\r\n","protected":false},"excerpt":{"rendered":"\ud83d\udd0d Key Highlights \ud83d\ude4b\u200d\u2642\ufe0f So, What Is Error 520? Let\u2019s not sugarcoat it \u2014 seeing &#8220;Error 520: Web&hellip;","protected":false},"author":3,"featured_media":6091,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_singular_sidebar":"","csco_page_header_type":"","csco_page_load_nextpost":"","footnotes":""},"categories":[2499],"tags":[4788,4780,4785,4789,4783,4787,4779,4782,4786,4781,4784,4790],"class_list":["post-6088","post","type-post","status-publish","format-standard","has-post-thumbnail","category-how-to","tag-520-status-code","tag-cloudflare-error-520","tag-cloudflare-issues","tag-cloudflare-server-error","tag-cloudflare-troubleshooting","tag-cloudflare-unknown-error","tag-error-520","tag-fix-error-520","tag-how-to-fix-520-error","tag-http-520-error","tag-web-server-error","tag-website-error-fixes","cs-entry"],"_links":{"self":[{"href":"https:\/\/www.kaashivinfotech.com\/blog\/wp-json\/wp\/v2\/posts\/6088","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kaashivinfotech.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kaashivinfotech.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kaashivinfotech.com\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kaashivinfotech.com\/blog\/wp-json\/wp\/v2\/comments?post=6088"}],"version-history":[{"count":3,"href":"https:\/\/www.kaashivinfotech.com\/blog\/wp-json\/wp\/v2\/posts\/6088\/revisions"}],"predecessor-version":[{"id":8781,"href":"https:\/\/www.kaashivinfotech.com\/blog\/wp-json\/wp\/v2\/posts\/6088\/revisions\/8781"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.kaashivinfotech.com\/blog\/wp-json\/wp\/v2\/media\/6091"}],"wp:attachment":[{"href":"https:\/\/www.kaashivinfotech.com\/blog\/wp-json\/wp\/v2\/media?parent=6088"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kaashivinfotech.com\/blog\/wp-json\/wp\/v2\/categories?post=6088"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kaashivinfotech.com\/blog\/wp-json\/wp\/v2\/tags?post=6088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}