http://forums.happy-messaging.com/discus/messages/35/1214.html
read the post by Lance Toms (Lance4k)
he has a solution to everything
i get the same error as the original poster and can connect on certain days it seems, I was able to connect earlier today and now I am not however if I run ‘windows messenger’ the one that comes with XP I can connect so I have no idea what the problem is