I recently moved and reconfigured my new network to work with Plex, as well as had to re-sync some HDDs back into a RAID I'm running (though the RAID is only tied to the home directory). Neither should have affected Plex, so I'm not sure exactly what caused the problem.
From what the logs say, it looks like Plex has some certificate issue as well as an issue with binding to the correct address:
Jun 05, 2016 10:00:46 [0x7f48bc96f840] DEBUG - BPQ: [Idle] -> [Starting]
Jun 05, 2016 10:00:46 [0x7f48bc96f840] DEBUG - Opening 20 database sessions to library, SQLite 3.8.9, threadsafe=1
Jun 05, 2016 10:00:46 [0x7f48bc96f840] DEBUG - Running migrations.
Jun 05, 2016 10:00:46 [0x7f48bc96f840] DEBUG - ChangestampAllocator: initialized to 73315
Jun 05, 2016 10:00:46 [0x7f48bc96f840] ERROR - CERT: Found a certificate, but couldn't install it.
Jun 05, 2016 10:00:46 [0x7f48bc96f840] DEBUG - Listening on port 32400 with queue of 128 connections.
Jun 05, 2016 10:00:46 [0x7f48bc96f840] ERROR - Error: Unable to set up server: bind: Cannot assign requested address
I'm running a headless Ubuntu 14.04.
Nothing is running on port 32400, so I don't know why it can't bind. I've tried both the latest 32-bit and 64-bit servers, reinstalling, etc. Not sure what I can do about the certificate problem either.
Any ideas?