Web Server Down Error 521
Hi everyone,
I’m experiencing a recurring issue with two of my websites, both configured with Cloudflare under the same account. About 1 out of 10 times when I visit my sites, I get an error 521: Web Server Down.
The rest of the time, everything works fine, but this random error is frustrating and affects the reliability of my sites.
Here are some details:
I’ve already followed several guidelines to optimize my setup, including:
Using SSL/TLS Flexible encryption on Cloudflare.
Ensuring that DNS settings are correctly configured.
I also have security plugins like Wordfence installed on my WordPress sites (default settings).
My hosting provider has confirmed that everything seems fine on their end, and no server issues have been detected.
This issue affects two different websites, both using the same Cloudflare account.
I’m reaching out to the community to ask for help in identifying the cause of this intermittent 521 error and how to fix it. Has anyone experienced this kind of random issue with Cloudflare? If so, how did you manage to resolve it?
Thanks in advance for your help!
4 Replies
Cloudflare Docs
Troubleshooting Cloudflare 5XX errors | Cloudflare Support docs
When troubleshooting most 5XX errors, the correct course of action is to first contact your hosting provider or site administrator to troubleshoot and gather data.
already went thru, still got the issue
Have you debugged your origin?
This means your origin is failing, there's not too much we can do to debug your origin
I'd recommend just checking error logs, utilisiation, etc.
Thanks for your feedback
how to debugged my origin?
I checked with hosting and they haven't found anything wrong on their side and checked my error log file no issue as well