This is a very strange problem.
I am trying to use RDP to connect to a Windows 7 PC over WiFi.
I only seem to be able to establish connection when I am near one access point.
At other access points I can access all the normal network services but just not an RDP connection to the Windows 7 PC.
At the same access points, I can use RDP to connect to servers.
This doesn't make sense. The access points shouldn't affect RDP connections just to one PC.