This week, I made a new Plex server, moving from Windows Server 2016 to TrueNAS Scale in a Docker container. In the process, for physical reasons, the server moved from my 192.168.2.0 subnet to my 192.168.1.0 subnet. Some combination of these changes made my Plex server inaccessible from any of my clients except through Relay. I’ve gone through Plex’s support article and tried every solution outside of disabling any proxies or VPNs because AFAIK my server has none, and I haven’t had any luck. I’m anticipating some sort of configuration issue with TrueNAS, but my google-fu hasn’t turned up anything useful. Any suggestions or help would be appreciated.
Are all your playback devices still back on the 192.168.2.0 subnet?
No. The AppleTV has always been on the 192.168.1.0 subnet even before the switch, and I also checked using the webapp on my PC on the 192.168.2.0 subnet. Neither client could communicate with my server.
After doing some more digging, I was able to resolve my issue. I had noticed that my Plex server in the Server Settings->Remote Access had a completely different private IP than the server, and with further investigation I was able to find this thread on the TrueNAS forum which had similar issues:
In the end, I hadn’t configured the Docker container in TrueNAS Scale to use the host’s networking, so it was limited to an internal Docker-specific network as far as I can tell. Checking the “Configure Host Network” option in the settings of my Plex docker container resolved the issue.
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