504 Gateway-Timeout on scp/index.php

[R00T-Runner]

Suddenly one user (of course it is my admin-user) is not able to open /scp/index.php. The displayed error is:

504 Gateway Time-out
nginx

every other agent (and the other admin account) is able zu open said page. It only affects my account, tested from various clients/ browsers/ internet connections.

I can open /scp/settings.php without any problems. But when I jump to the Agent-Area I get the same Error again.

The Server is a V-Server running PLESK with PHP 8.2

osTicket-Version	v1.18.1 (0375576) —  Aktuell
Server-Software	Apache
MySQL-Version	10.6.16
PHP-Version	8.2.15

[ChrisTG742]

What looks a bit unusal to me is, that you say the 504 comes from an nginx. Now the application obviously runs on Apache?
Is there some transparent proxy using nginx (maybe for SSL encapsulation) in from of the application?
If so, you should start tracing the error in the log of that service. From my experience, problems like this are most often connected to too small proxy-timeouts or any other limitation. The respective error log on the machine will tell you.
HTH