Resolved I customized the Plesk administrative URL, but if I use Cloudflare proxied DNS, it immediately logs me out.

[Steg]

Server operating system version

CentOS 7

Plesk version and microupdate number

Plesk Obsidian Web Pro Edition 18

So I followed the instructions in this KB article to change the Plesk admin login URL (my eventual goal is to block off access to port 8443). After that, I updated the LE certificate for the site and verified the login and HTTPS works. It does.

However, as soon I turn on the Cloudflare DNS proxy service, I can get logged in, I see the administrative panel for a couple of seconds, then it logs me out. Is there any way to make this work with Cloudflare?

If it matters, I'm using Cloudflare all over the rest of the domain and it works fine.

 

[Kaspar]

Is the "Allow IP address changes during a single session" option enabled in Tools & Settings > Session Idle Time?

 

[Steg]

It is now and is seemingly fixed. You're a wizard. Thanks!