"This server cannot reach the Internet. Please verify Connectivity and try again."

Good Morning.
As the @JCHH, I have QNAP and don’t know how to get the information from Whireshark.
I can provide the logs for you.

The problem occurred at

Aug 13, 2020 23:19:05.697 [0x7ff31e5a1700] WARN - Need to be signed in and connected to the Internet to refresh a plex music library.

Maybe related with this?? Remote Access on QNAP has "red status" with Reverse Proxy (Traefik)

Plex Media Server Logs_2020-08-14_09-16-01.zip (6.7 MB)

Thanks!