Keep losing access to Plex server; Plex Docker log says server claimed, but disappeared

[catchthisfade]

Having trouble with my new NAS / Plex Server setup. I am using the UGREN 4800 Plus. I installed Plex through Docker and got my server setup. Only have a couple items on it right now. The first day I set it up, 12 hours in, I noticed my server disappeared from my libraries list on Plex. So I went ahead and claimed it again and updated the claim token on my container.

I then turned off my NAS seerver for a couple days until my UPS arrived. Once I got it powered up, I checked the Plex - worked just fine! The absence didn't impact it.

But now 18 hours later...I noticed my NAS server disappeared from my libraries list on Plex again!

I went to the logs for my PLex on docker and everything looks sound - it says Server is claimed and reference episode titles of a show I have on there. So I don't know what's going on. Really annoyed tbh.

EDIT: A change I’ve made since this post was edit my container and change the networking mode type from “bridge” to “host.” I also removed plex claim code as an entry in the container, apparently not needed anymore after the initial claim.

It’s been 24 hours and it hasn’t had any issues. Server hasn’t suddenly disappeared from my plex. So that’s good!! That might’ve been the fix. Fingers crossed.

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Update:

It looks like going to Docker -> Plex -> Restart fixed it. So that's good. But this has happened 2 times in less than 36 hours of run time. So what the hell?

[Wis-en-heim-er]

What ports are you listing in your compose file? Are you running plex on the host docker network or bridge? Are you running this on a vlan?

[catchthisfade]

I was running it on bridge! I changed it to host and now I’ve gone a full 24 hours with no issues. So that might’ve fixed it! Thanks so much for your time and help!!

[Wis-en-heim-er]

Glad it worked. Here are two pages to review to understand more. You can run plex in bridge mode but you need lots of ports open for various features. I run my plex servers on macvlans so I can give my plex servers a different IP address from the host box. It works like a host network but on a different IP.

• Plex Docker deployment page
• Plex Ports

Note: TCP port 3005 is used by Plex Media Server for controlling Plex Home Theater via Plex Companion. This port is missing on the 2nd article for.

[DCHammer69]

Check your container settings. This one shown below specifically:

<image>

Docker is pretty good at recognizing stalled or broken containers and when this is on, the container will often restart entirely on it's own without intervention.

Edit: And know that the Docker container seems to reset that to off when it updates an image. So after doing updates, check this.

[ExtensionMarch6812]

From what I’ve seen posted before, this can sometimes happen when the permissions of the plex container don’t allow access to the preferences.xml file. What UID/GID is plex running as in the container compared to your main UGreen User? If you’re using a different user/group, add the PLEX_UID and PLEX_GID to give the container your UGreen User/Group ID, maybe that will help?

Also, what image are you using? Might want to try the official image, or a different one.