backdorr

If your issue is caused by Plex, then I am guessing not. The first thing the plex plugin does is set the ulimit for you, which would override any defaults that have been set by unraid. In my case, the ulimit Plex used was too low so I needed to change the value of PLEX_MEDIA_SERVER_MAX_OPEN_FILES found in /boot/config/plugins/plexmediaserver/exportsettings. If you issue is not being caused by Plex, then this may be just the fix you need.

My solution in short: In /boot/config/plugins/plexmediaserver/settings.ini change PLEX_MEDIA_SERVER_MAX_OPEN_FILES=10000 and restart your server. How this worked for my setup: I ran into the same problems problem as you last week running rc8a. This was completely out of the blue with no known system changes. After applying everything in this thread and every other thread I could find related to the topic I was out of luck. But after a week of uptime, I think I have found my solution. My plugin setup is similar srg2k5's. I disabled all the of the plugins and started to bring them up one at a time. When I brought up Plex, then I would get the transport error. After digging into how the Plex plugin get started with rc.plexmediaserver. The first thing it does is source the config file at /boot/config/plugins/plexmediaserver/exportsettings which at the very bottom is setting the ulimit -s ulimit -n $PLEX_MEDIA_SERVER_MAX_OPEN_FILES PLEX_MEDIA_SERVER_MAX_OPEN_FILES comes from /boot/config/plugins/plexmediaserver/settings.ini which I believe was set to 4096. So all the work that I was doing to bump up the ulimit as suggested earlier in this thread was being thrown out the door. For Plex users seeing this issue, try and change PLEX_MEDIA_SERVER_MAX_OPEN_FILES to a suggested number and reboot your server.