Trouble connecting Squeezebox Duet to Logitech Media server running on NAS

Hey

My setup is a Squeezebox Duet (7.7.3) and Logitech Media Server (7.7.3) running on Synology Diskstation (DS710+)

I can see the Squeezbox Receiver and mysqueezebox.com in the Media Server and play all my music on the Squeezbox.

What i cant do is control the music on my NAS with the Squeezbox controller.
The automatic scan via "My Music" does not find the Media Server on the NAS and if i enter the the NAS ip (192.168.1.250:9002/)
under Advanced/Network/ connect remote library , I just get "Connecton not possible make sure the server is running and Logitech Media Server is installed"

What i have tried:
-Reseting the Squeezebox
-Reinstalling Logitech Media Server
-Automatic search for my music
-Entering the ip of the the Logitech Media server
-Opening the firewall for Logitech Media Server

Any ideas?