I've moved my server into another room of the house (a colder area of the house).

I've also replaced my old HH4 for my HH5. All is well, internet works on both.
The network share folders are accessible from both systems. Nothing else has changed.

I can Ping the server from my main PC perfectly.

I can no longer Remote Desktop it from my PC. Weirdness? Any ideas what's gone wrong lads?
HH5 setting I've missed perhaps?