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Sonos error message “unable to play “song” connection to plex was lost”. Plex on Sonos can move between music folders and tracks, but once a track is selected same error message occurs.

This started happening mid February 2024. In the past this has happened every time there is a new release of Plex media server. To fix the problem I would log into Plex media server on my Synology NAS DSM18+ running V6.0 to find a message that an update to Plex was available. Same message now, and new version of Plex media was server released Feb 13, 2024. New 64 bit version for Synology 6.0 installed ( stop Plexmedia server from running, download and install correck .spk file, re-start Plex media server). But problem persists.

Sonos on iphone can play Amazon music and other apps- TuneIn fine. Plex by itself on iphone can play music from Nas fine.

Sonos support contacted twice- Sonos re-booted, router/modem re- booted- no change. Speed of Internet checked and over 350 mbps/sec. Sonos deleted and re-installed- no change. Plex deleted and re-installed and Plex re-authorized- no change.

Setting for Plex on NAS has not changed as far as remote access, which port etc.

No further help from Sonos support, although technician had no experience with this problem, nor resources, despite other similar problems on this forum. The trial of setting available upload speed to zero- not help.

Ideas anyone?

If not enabled already, perhaps see if enabling UPnP on your router, aswell as manually forwarding TCP Port 32400 will resolve the matter for you. I’m using a different NAS, but latest version of Plex is working okay here on Sonos, so I suspect the answer lies either with the NAS, or your local router.

Is the problem possibly connected with using Plex/Sonos ‘Shuffle All’? I see that when browsing my considerable collection it takes time for pages of Albums or Artists to populate when viewing through the PC Sonos controller. I used to have similar indexing issues with the Sonos Library. 

I only use Sonos/Plex locally, so I don’t see why a remot access setting would be needed, unless it defaults to remote rather than local connection.

I don’t use shuffle all. I did resolve a new error message- “no available Plex Media Server has tracks. Please add tracks to your music library” at first by stopping and restarting Plex media server on my NAS, and later by uploading the latest Plex media server for my NAS. ON the exact day that Plex releases a new version of Plex Media server the above error message appears.

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