The Gnutella network is not run thru a central server!!!

I'm guessing your office has some type of restrictions that prevent you connecting. Stopping p2p use can be done many ways. Else there might just be too many firewalls & restricted access for 'foreign' programs to operate properly.

Do this simple test for us. Using your browser go here: http://www3.limewire.com:6346/ The page should say ‘Test Page was a Success’. What happens when you go there?