Issue Cloudflare Error 520/521

[othmaqsa]

Server operating system version

Ubuntu 20.04.5 LTS

Plesk version and microupdate number

18.0.49

Hello,

I want to reinstall Cloudflare. If I remember correctly, I had already tested it before, but I got a 520/521 error (website down), except that the server was working normally.

Is there a conflict between Fail2ban and Cloudflare?

Any idea to solve this problem?

 

[Peter Debik]

Hi @othmaqsa , have you tried the solution from this article?

Incorrect IP addresses logged by Plesk behind load balancer, or reverse/forward proxy

Applicable to: Plesk Obsidian for Linux Plesk Onyx for Linux Plesk for Linux Symptoms Plesk is running behind a load balancer, forwarder, or reverse proxy (Cloudflare, Google Cloud Load Balanc...

support.plesk.com

 

[othmaqsa]

Hello @Peter Debik ,

Not yet, I'll try now.

Thanks.

 

[othmaqsa]

BTW @Peter Debik , I have already a rDNS configured in the router of my data center, there is no impact regarding the delivery of mail when the cloudflare is configured , that's it ? ?

 

[Peter Debik]

I have not understood what you are asking. Could you please rephrase the question?

 

[othmaqsa]

I have not understood what you are asking. Could you please rephrase the question?

After Cloudflare will be configured, there will be any problem regarding the delivery of the mail?

 

[Peter Debik]

I feel uncapable of predicting what will happen in the future. It is really difficult to say. However, when you follow the instructions given in the above mentioned knowledge base article, very likely you can succeed configuring your server to work with Cloudflare.