Hey,
12 hours ago my Plex server was working without issues, playing any media files of the libraries. Now it seems that something happens because I cannot play literally nothing. I tried it from different devices (TV, smartphone, laptop, Plex for Kodi through Odroid C2 with LibreElect) but none of them worked. The server has been already rebooted.
It's a Ubuntu 16.04 machine, last PMS version installed. Attached you can find a log that maybe helps!
Thanks everyone.