A 521 error happens when Cloudflare is unable to make a TCP connection to your origin server. Review the suggestions in this Community Tip for Quick Fix Ideas.
Error
Try the suggestions in this Community Tip to help you fix Error 521 : Web server is down.
Background
A 521 error happens when we are unable to make a TCP connection to your origin server. Specifically, Cloudflare tried to connect to your origin server on port 80 or 443, but received a connection refused error. This is often caused by security or firewall software and happens if the origin server has directly refused Cloudflare’s proxy request.
[Banner in tip catalog]
Quick Fix Ideas
…
2 Likes
system
August 13, 2023, 7:19pm
4
This topic was automatically closed 3 days after the last reply. New replies are no longer allowed.
