My Sonos system used to work with Plex. I had the Plex software installed on a Synology DS218+ running DSM 6. I am using Plex for one reason only - to give Sonos access to my entire music collection. I have some of my music in my Sonos library and the remainder in my PlexMusic library to access on Sonos via Plex.
- Two weeks ago Synology suggested that I update from DSM 6 To DSM 7.
 - I installed DSM 7. My current installation is: Version: 7.1.1-42962 Update 6
 - After the installation of DSM 7 Sonos stopped working with Plex.
 - I deleted Plex and tried a clean install.
 - I created a Directory on the Synology titled PlexMusic to store my music files. I put excess files that Sonos can’t see there.
 - I verified that Plex is able to see this library which it has scanned and indexed . I can view the library in the Plex app running on the Synology.
 - I removed and added Plex back as a Music Source in Sonos.
 - Plex does not work as a Music Source under Sonos. When I click on Plex I receive the message: No Plex Media Server available. Please make sure your Plex Media Server is accessible.
 - I found some suggestions online and made the following edits (in “Shared Folders”) to Synology permissions:  (https://nascompares.com/guide/how-to-install-plex-on-a-synology-nas-with-dsm-7/ )	
- Directory: Plex		
- Gave permissions under “Local Users” and “System Internal User” to give Plex Read/Write Access
 
 - Directory: PlexMusic		
- Gave permissions under “Local Users” and “System Internal User” to give Plex Read/Write Access
 
 
 - Directory: Plex		
 - Plex still does not work as a source under Sonos. When I click on Plex I receive the message: No Plex media server available. Please make sure your Plex Media server is accessible.
 - What should I try next?
 
