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Error 521 happens when Cloudflare's globally distributed reverse proxy servers attempt to connect to your origin over port 80 or 443, but get rejected. The "521" status code indicates your web server refused the connection or sat behind a firewall that blocked Cloudflare's access.
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The error message "Error 521: Web server is down" indicates an issue with the server. That is Cloudflare's error message when the origin server does not respond to Cloudflare's request. This guide explains common causes and provides methods to troubleshoot and resolve error 521. Prerequisites:
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If your website is showing the "Error 521: Web server is down" message, it means that your origin server does not respond to Cloudflare's requests. The "Error 521" often happens due to a server's firewall or other security software that blocks Cloudflare IPs.
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That ominous "Web server is down" message might leave you feeling lost and unsure where to start troubleshooting. But don't worry – help is here! This guide will walk you through the common causes of Error 521 and provide step-by-step instructions to get your WordPress site back up and running.
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In this article, we'll dive deep into the causes of the 521 error and provide you with these step-by-step solutions to get your website back up and running smoothly. Deactivate mod_reqtimeout and mod_antiloris; Ask Your Hosting Provider to Enable Port 443; Check Whether the Origin Server Is Running; Clear Server Cache; Check your SSL Certificate
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HTTP response status code 521 Web server is down is an unofficial server error that is specific to Cloudflare. This HTTP status code occurs when the HTTP client was able to successfully connect to Cloudflare but it was unable to connect to the origin server.
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Error 521 occurs when Cloudflare has its connection refused by the origin web server (i.e. where you host your website). If none of the solutions above fixed your issue, I'd recommend contacting Cloudflare support and asking for their help.
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Error 521 is a generic HTTP status code that indicates your web server is refusing connections. It's also sometimes referred to as the "Web Server Is Down" error. Specifically, error 521 means that the origin web server has rejected the connection from Cloudflare. This could happen for a variety of reasons, but most commonly it's because:
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Error 521 occurs when the origin web server refuses connections from Cloudflare.
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Error 521 Web Server is Down, occurs when the origin server a client is trying to get resources from refuses connections with Cloudflare's proxy. To serve content requested by a client, Cloudflare's proxy service establishes a connection on port 80 or 443 with the origin server that has the requested resource.
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