Hi,
I installed Skype 3.0 on one corporate PC running Windows 2000. With 2.5 going online was no big deal, but with 3.0 Skype will become available. Using a Proxy or not doesn't matter. So after I uninstalled 3.0 and moved back to 2.5 everything worked again.
Did anything change in the protocol?
Cheers,
Brenno de Winter
Leave it seems to be known issue. I'm sorry for the inconvenience!