I know this a post from a previous post. I would try sql profiler and monitor the connections to see if the server is rejecting you or are you not getting there at all. You can use vnc or terminal services to connect to the server (for a good connection) and monitor your connection status.
Sorry - I just received your emails - I only have access to my email at home. Basically, you will need to find a machine that has access to the sql server (or login to the actual sql server) and run the profiler and see if at least the server sees that you are attempting to hit it.
I tried to connect from other machine in sql enterprise manager and query analyser for the specified user, it connects - but through my login in the domain it does not connect.
For the past 1 week iam trying to connect from a XP Machine , it does not connect, i tried to connect from a Windows 98 machine it connects, from a machine that has been logged as an administrator it connects, now i've changed my machines OS to Windows NT Server - now also not connecting .