It’s in a container, running with ‘--net=host’, so it should behave from a networking perspective as if it’s running directly on the host.

Hi @pwt

And we’re doing the same. We still can’t reproduce the issue - though it seems related to SSL. 

Hopefully, more information will come to light soon. Until then, being unable to reproduce, we’re unable to continue.

Thanks. Just to check: you’re testing using an S1 Sonos system?

If so, this is really odd. It used to work perfectly, but stopped doing so several months ago, despite no changes in networks or other relevant configuration settings -- other than normal software updates to Sonos and Plex.

I did wonder if it might be as simple as a certificate expiry, but if you’re not able to reproduce the issue, it’s not that.

Yes - S1.

My tier 2 colleague is now trying with the official Plex container as he wasn’t utilising it. 

Which made no difference. Still unable to reproduce.

@pwt would you mind creating a new test container with a new instance of Plex in it and test if that fails too?

Thank-you for looking into this issue @Corry P. that’s much appreciated. I will continue to press Plume to have the option to enable ‘Nat Loopback’ on their router. Plume have been canvassed about the issue previously and by others too, so I’ll see how that goes.

There are other ways to play the same music on Sonos, so it’s not a bother, other than perhaps the time spent trying to eventually get to the crux of the matter.

I can do that, but not for some time, because I need to test using my remote Sonos S1 system, which is installed at a different property.

If I get time, I might flip my local S1 system onto a different network to the Plex server, and use that for testing.

I do appreciate you & your colleagues taking time to look into this.

Apologies for the delay responding.

I’ve just tested this issue again and I can no longer reproduce this either, despite the problem persisting for months previously with various versions. Seems like something has changed in the Plex/Sonos integration or something that was cached has expired (I’d restarted everything multiple times previously to no avail).

For reference, I’ve been running Plex in a Docker container on an Ubuntu server. External port access and NAT hairpinning are all fine.

I forgot to note what version of Plex I was running before, but it started working there. I’ve just updated to 1.25.6.5577 (which only has ‘preferred’ and ‘required’ as secure connection options) and it works in Plex internally (e.g. 192.168.x.x), in Plex externally (e.g. 80.x.x.x), via app.plex.tv and from Sonos. i.e. all seems to work everywhere so looks to have been resolved. For me, at least…

Hi @timmyc 

I’m glad to hear that the issue, for you at least, now seems to be resolved - thanks for sharing those details, and for updating us all here.

Is anyone still able to reproduce this issue after reboots and updates?

Yes, still not working for me. Latest versions of everything.

Hi @pwt  

That’s unfortunate. If you happen to find anything out about what’s going on, please update us here. Thanks.

Just to briefly mention, I did liaise with Plume support over the (on-going) NAT loopback issue and now with the latest Plex server update too and assistance from Plume, I have Plex now working on all platforms including Sonos and can at last enjoy my Plex lifetime pass.

Great for when travelling/camping around the UK to be able to access my home music/media library and play to the Roam (or Move). So all’s well that ends well.

Hi @Ken_Griffiths 

Fantastic! Glad to hear it! Thanks for updating the thread.

Chiming in to say I have the same issue as described above. It’s intermittent: from the Sonos app (S2 everything) I can browse music from Plex and start an album. Sometimes the whole album will show the error, one after another. Sometimes just a few songs, then randomly it will start playing one. Sometimes no issue.

I’m not on Plume, but Unifi.

Maybe try the Sonos system setup in SonosNet mode by wiring one Sonos device to your primary unifi Hub/Router and see if that may perhaps resolve the intermittent issue for you.