Remote network access - what is DeviceDescription.xml

[davsun55]

Not working - MediaMonkey reports 'The stored media server is unavailable'
I found the minimserver.config file with a UDN of cd78c18a-c902-4d39-8fad-66d768c4fd5e
But there's no Upnp folder or device.xml file on my server
I also tried port-forwarding 9791 to the internal IP address of my NAS (192.168.1.16) without success
I also tried using port 9790 after seeing that in the minimserver.config file.
BTW is the above information in any guide anywhere? Maybe with some background to help me understand what's happening?
Thanks,
David