I have the same problem in the latest Plesk. I have ordered a second ipv4 address from my service provider, but I can't configure it in Plesk. Can anyone help me?
I have Plesk Obsidian Web Host Edition Version 18.0.60 Ubuntu Linux 22.04.4
After the Plesk update, the websites using Open Journal Systems, Open Monograph Press and Open Preprint Servers became inaccessible. (500) The other (WordPress) websites work without errors.