I get the same thing, only I've noticed that if I open another browser window I can see my name in the "Other Users" list... still the page never is found and hence doesn't return.
It appears to be a problem with the browser being redirected to a server address that doesn't exist?
I still can't log in. Does the server redirect the browser upon authentication? If so what's the URL? I might need to add the host to my hosts file until DNS begins trickling down properly.