I’d like to chime in to say that I’ve been experiencing the same behavior on my Synology NAS.
The problem popped up out of nowhere somewhere around a week and a half ago, probably following an update to the Plex DSM package. No settings had been changed in the network settings in Plex itself or on my router for months when this happened. Everything apart from matching movies and shows seems to be working and I can even connect to the server remotely.
Now that I’m checking, I’m actually unable to change the port setting in Remote Access settings, which now just gives me an eternal “Connecting server…”
As such, I’m not convinced this is a problem on the user’s end…
A Plex employee tried to help me here but nothing came of it: Tv matching programs imdb gone and home movie service - #10 by MovieFan.Plex
