I got the app Subsonic Channel. It asks for the server name and as an example gives 'server:4040'. I tried
myserver:8080
http://myserver:8080
http://192.168.1.100:8080
http://mysub.subsonic.org
However, I always get the error message that the connection to the server failed. The port is correct and so is the username and password. I can connect from other computers on the same network. The device is Roku 2 XS. Any advice on how to get this working is appreciated.