Fix Error 521 with WordPress and Cloudflare


Error 521 can occur when using Cloudflare with WordPress and is typically caused by a connection issue between Cloudflare and your web server. To fix this error, you can try the following steps:

  1. Check that your DNS settings are correctly configured in Cloudflare. Make sure that your domain is pointing to the correct IP address of your web server.
  2. Clear your browser cache and cookies, as well as your Cloudflare cache.
  3. Check that your web server is online and responding. Restarting the web server may resolve the issue.
  4. Ensure your web server is configured to support SSL/TLS connections. Cloudflare requires SSL/TLS for all connections.
  5. Ensure your web server is configured to accept connections from Cloudflare IP addresses. You can find a list of Cloudflare IP addresses here:
  6. Check your WordPress setting and make sure that your site is using the right protocol (HTTP or HTTPS) and the correct domain (www or non-www)
  7. Check your .htaccess file and make sure that there are no rules that are blocking Cloudflare’s IPs or redirecting traffic.
  8. If none of the above steps works, there is likely an issue with your server. Contact your hosting provider for assistance.
  9. You can also try temporarily disabling Cloudflare to see if the issue resolves; if it does, it means that the problem is with Cloudflare.

It is worth mentioning that if you are on a shared hosting plan, the problem might not be related to your website but to the server’s resources. In this case, you may need to contact your hosting provider to help you troubleshoot the problem.

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