Suddenly no remote access

Sorry for repeating myself, but post must have got lost/overseen.

A couple of weeks ago my Android apps suddenly lost access to my Linux Remote Server
Created a post about it: Android App unable to connect to Remote Servers

Locally everything works fine.
Remotely only Android Apps fail to find server.
PlexAmp for Android, Plex App for iOS and WebPlayer (DDNS -plex.mydomain.dom:32400) all work fine.

I looked up everything I could, PMS Network+Remote settings, Router forwarding, nginx reverse proxy X-headers-forwarding, it all seems to check out OK.

Saw some cert errors(CERT: incomplete TLS handshake from 80.187.67.39:15370: sslv3 alert certificate unknown (SSL routines)) in the logs and though it might be my nginx+letsencrypt doing something wrong, but couldn’t find the issue and assumed it was an Android App issue, since everything else works.

After using 3 different versions of the Android App, not so sure anymore.

Not sure if it’s related, also found “MyPlex: Invalid connection URL ‘plex.mydomain.dom’.” in the logs, but the same address works using a browser remotely.

Most details are on my linked post and am willing to provide more info/logs if required.

Would appreciate any help/insight.

Plex Media Server Logs_2023-09-11_16-58-25.zip (4.3 MB)