Issue Help, Please! Redirecting to login_up.php

[alx.belarus]

Server operating system version

Ubuntu 22.04.5 LTS

Plesk version and microupdate number

Plesk Obsidian 18.0.65 with Update #2, Web Host Edition

I need help with the following issue:
I am using Plesk Obsidian 18.0.65 with Update #2, Web Host Edition. When trying to access my website, it redirects me to mysite.com/login_up.php, which is the hosting login page. Everything was working fine a couple of days ago. DNS settings seem to be fine, but the login page still appears. Where should I start troubleshooting this issue?

 

[alx.belarus]

Problem solved, but now it redirects to the Web Server's Default Page. The files are in the root directory, the domain is linked to the hosting, and the site is connected through Cloudflare.

 

[Raul A.]

Do you send the traffic from Cloudflare to the correct IP address?