Try "the usual."
Some firewall is installed. Remember that even when "disabled" they still work. I end up uninstalling such AFTER I update the OS to the latest Service Pack and patches so we don't get the MS Blaster or other worms.
Next, be sure to let your company's IT fix it. It's for their benefit.
I am wondering if anyone can help me with my problem connecting to the VPN. When trying to connect I get an Error 721: Remote computer is not responding. I have already ruled out the router and the VPN server. I can connect just fine with my user name a password form another PC, using the same router and server. There is something on my own configuration that is causing me not to be able to connect. The VPN Client is not the issue either. I have that set up exactly as the other pc that works. I am using WIN2K Pro, and have both the windows version of VPN Client and another provided by my company. Both give me the same result. Any help would be appreciated. Thanks.