Random 521 Error on Website

[neiljay]

@ignjatradojicic

I do have a firewall setup but it’s configured correctly both port 443 and all the cloudflare origin ips are allowed.

You need look into other areas too. Here’s the CommunityTip for a proper guide:

Community Tip - Fixing Error 521: Web server is down

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 …