Sonos / Plex login fail

After many years of sucessful use, today none of my devices (a PC and several IOS devices) running the Sonos app can see my Plex libaries. The libraries are accessible direct to Plex apps. I have tried re-authorizing without sucess. I have spend time on the phone to Sonos, who finally have told me that there is an error at the point that Sonos tries to log in to Plex, and that I need to contact you. Please help.

Thanks. Here is the logs zip. The NAS is now asking me to upgrade tp DSM 7 which I will do later, but could do now if that might help?Logs.zip (5.1 MB)

Currently they have login problems Plex Status

Great. I’ve upgraded to DSM 7 and my PC Plex and the IOS app work fine - but Plex in Sonos is still out. So, how do I fix this? I clearly can’t sort it from here.

I’m in real trouble now. Despite the Sonos issues, at least Plex was working last evening (UK time). Overnight I now don’t have access through Plex on any device. Now any attempt to play anything gets a mesage “Playback Error - Please check that the file exists and that the necessary drive is mounted”. What does this mean to a non-IT expert like me? The files are, of course, still there and playable by iTunes for example.
I’m also not certain about your IP address suggestions. There is no ‘server’ choice in plex settings, but there is a ‘network’, and I typed “192.168.1.0/255.255.255.0” into the LAN networks box. Was that right? Am I correct that this allows everything from 192.168.1.1 to 255? Anyway, that hasn’t changed anything.

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