Home How To Cloudflare Error 521 Web Server is Down Easy Fix

Cloudflare Error 521 Web Server is Down Easy Fix

Error 521 is an error that is directly related to Cloudflare 521 Error message (similar to error 520) that appears whenever your web server refuses a connection with Cloudflare and results in Cloudflare Error 521 Web Server is Down. In this article, I’ll guide you on the Easy Fix Cloudflare Error 521 Web Server is Down. In this post, you’ll learn about, and how to fix error 521 web server is down in mobile.

What is Cloudflare Error 521 Web Server is Down?

As you already learned above what the error 521 web server is down message means and how it is related to Cloudflare error 521.




What is Cloudflare?

Cloudflare is usually used for increasing web application security and performance. Cloudflare enhances overall performance, security, and speed and hence reducing the loading time of any website that is being hosted via Cloudflare.

What is Cloudflare Error 521 Web Server is Down?

As mentioned above, the Error 521 Web Server is Down is usually caused by two situations:

cloudflare error 521, fix error 521 web server is down, how to fix error 521 web server is down, the web server is down, An example of the Error 521 message

First and foremost, your WordPress website’s server may be down (temporarily). Even if everything is configured correctly from your side, your WordPress Site’s server may be currently offline, and so Cloudflare won’t connect, and it will show error 521 Cloudflare.

Second, your web site server might be running fine, but it might be blocking Cloudflare’s connection requests for some reason. This is because Cloudflare uses rever proxy for all the traffic coming to your origin server because of it some security solutions block Cloudflare’s IP address.

Whenever this happens, Cloudflare won’t be able to connect and will throw the Error 521 Web Server is Down message.

How do I fix 521 Error for Cloudflare and WordPress?

Now, you know why the 521 error occurred, let us dig further into How to fix error 521 in WordPress.

You can follow this quick fix error 521 web server is down steps:

  • Open Google Chrome.
  • Now go to the Google Chrome settings window by clicking on three-dot on the top right corner of the browser.
  • Once there, go to Search Engine and click on Manage Search Engines.
  • Now, click on Add Search Engine.
  • Once done that, Type in Google in Search Engine, google in Keyword, and https://www.google.com/#q= in URL with %s in place of query box.
  • Finally, try refreshing the web page to check if the “Error 521 Web Server is Down” error is fixed or not.



Video Guide

Suggested:

If the above step didn’t work for you, then you can try this one below to fix Cloudflare 521 error web server is down.

How to Fix Error 521 for WordPress and Cloudflare

If the above steps didn’t work, then you can use it as a way around to fix 521 error.

Step 1: Test Origin Server is Online

Before going any further, you’ll need to make sure that your website server is online and working usually. And if it’s not functioning normally, there’s no sense of troubleshooting.

To test If your Website’s Origin Server is online, if you are using Mac or Linux, then you can use cURL command to check server availability from command.

However, windows don’t have cURL installed; you can use KeyCDN’s online HTTP tool.

All you have to is enter http://1.2.3.4, where 1.2.3.4 will be the actual IP address of your server. You can find your server IP address here.

If you find any error on your server you are not sure about, contact your hosting provider instantly.

Suggested –

Step 2: Whitelist Cloudflare IP from your server’s firewall

If your WordPress server is usually working, but you still face 521 Error message when you try to access your website, the next step you have to is whitelist Cloudflare’s IP addresses.

Here you will find a list of Cloudflare’s IP addresses.

Moreover, make sure you are not blocking any IP addresses in .htaccess, and iptables (contact your host support).

Step 3: Lookin for any Technical issues

At last, you might look for more specific issues that may be causing your website’s server configuration.



  1. If you just started using Cloudflare’s HTTPS, it might be that your origin server doesn’t allow Cloudflare’s IP address to access 443 port. In that case, try using Flexible SSL instead of Full SSL.
  2. Make sure your mod_security is up to date, if applicable.
  3. Disable Apache modules (mod_antiloris or mod_reqtimeout), if you are using one.

Conclusion

If you enjoyed this step by step guide on Cloudflare Error 521 Web Server is Down, share this easy fix Error 521 tutorial if you find it helpful. Do comment if you have any questions.

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