Hello. I am currently unable to play any track in my Plex music library through my Sonos S1 system. I can see and browse music fine, but all playback attempts fail with the message shown the title. Further, I am unable to cast to any Sonos device from the Plex app on Android or Windows.
For an additional description of my issue, see this thread on the Plex forums:
Error Streaming to SONOS - Plex Players / Streaming Devices - Plex Forum
Based on errors generated in the Plex logs, this appears to be a TLS handshake issue with the Plex service. My issue is similar or identical to what several users have reported here on this earlier thread:
Plex integration: "Unable to play ''track]' - the connection to Plex was lost" | Sonos Community
However, I have been unable to resolve it.
My Plex server is fully accessible outside my network. My router (eero) claims to support NAT hairpin, and I can see my Plex server from inside my network using my external ISP-assigned public IP address. I have deleted and recreated the Plex service in Sonos and restarted the Plex server to no avail.
My configuration is as follows:
Plex host: Headless install of Windows 11 Pro 22621.2134 on AMD Ryzen 9 6900HX
Plex Server Version#: 1.32.5.7349
Player Version#: SONOS S1 system (11.10.1, latest), all Plex client apps I have tried
Router: Eero Pro 6E mesh running software revision 6.15.3 (current)
LAN: mix of hardwired and wireless (most Sonos devices are hardwired)
I would welcome any thoughts or suggestions.