Music Library (Minimserver) No Longer Visible

[Peter@57m]

In your first post you say you can see the NAS on the network - is that from the iPad or from some other device?
If you try entering 192.168.1.51:9790 (this should be replaced with the IP address of your NAS) in Safari on the iPad, does it show the MinimServer status page?
Do any of the Synology apps see the NAS from the iPad, such as DS Finder DS File.
I am trying to find out if the iPad can see the NAS but not MinimServer or cannot see the NAS at all.

PS: if you don't know the IP address of the NAS, install the app fing on the iPad which will show you the IP address of all items on the network.