Its going to be something minor and stupid I've missed...... but here I am anyway ;)

Running Server 2016, have installed Shoutcast DNAS (for streaming), Winamp etc, can access DNAS web interface (port 8000) happily from the server. Can also access it from other machines on the network.

Port forwarding rules have been set on the router. 

But anything external, is unable to connect to DNAS HTTP interface. 

Stupid thing is, this all runs fine under the old "server" (Win10) still - and yes, I did update the port forward to the new server IP :)

Other external accessed services on the new server are running fine.

Windows Firewall is disabled.

What am I missing........