Thanks mcleod, I'm having errors trying to connect two ubuntu systems though.
New screenshot:-
http://dl.dropbox.com/u/39545887/Screenshot.png
The laptop (from which the screenie is taken) is running 11.04 and is fully up to date, The desktop has just been upgraded to 11.10 though the error is identical, I get the same error if I try and connect between my two ubuntu 11.10 desktops with hard wired lan connections also!!