Proxmox + Cloudflare = 522

Website, Application, Performance
1

Hello helpers,

we have a problem using Cloudflare and hope you can help us.

Setup:

  • Cloudflare
  • Own server incl. sys admin (but no experience with Cloudflare)
  • Proxmox
  • Firewall Watchguard
  • Wordpress (incl. wp rocket cloudflare addon)

What we did:

  • Regarding to the Cloudflare docu (not allowed to share a link here), we deactivated https redirect on our server (to avoid to many redirects)
  • We allowlisted all cloudflare ips and checked that no ip’s are blocked

Problem:

  • We see very often a “522 timeout” or cant connect to the pages at all. When we pause Cloudflare on the machine, it works.
  • Very important to say, that the WordPress applications work temporary
  • We see a CPU highload on our server that is set up to host more than 100+ Websites

Is there anything what we missed to set up? I’m pretty sure, that it may related to SSL issues?

4

Before enabling Cloudflare, did each of the Websites had it’s own SSL certificate, valid and was working over HTTPS correctly? :thinking:

May I ask what SSL option have you got selected under the SSL/TLS tab at Cloudflare dashboard for your domain ( Flexible, Full, Full Strict … )?

May I ask if the Firewall does filter the HTTPS traffic, or has some kind of a checking/verifying the HTTP packets since it sits in between the website and Cloudflare?

Could be Cloudflare IPs aren’t allowed on the Proxmox firewall instance?

:white_check_mark:

Helpful articles:

Community Tip - Fixing Error 522: Connection timed out