TBH, I would rather not break my current viewer settings :-). If you can confirm that the contents of "%APPDATA%\Remote Utilities Files" folder is all that I need to recover, I will try tomorrow (time permitting).
However, I think network issues are highly unlikely here, at least in the sense you probably mean them - I am using a set of direct connections over an SSL tunnel, and the tunnel has been tested and retested multiple times and is working perfectly. Plus, if it *was* a network problem, the host's callback connections window should not display "connected"...
In fact, I am completely baffled by the need of the hosts to actually provide *any* callback port. Obviously, the hosts are connecting to the viewer, but they are only connecting to one specific IP address and one specific port. They don't have any need for a local port setting, as any traffic should go over the connection they initiated.