HELP !! Norton Personal Firewall & ADSL sharing

[Johne Deluxe]

Please help me !

I have a server (OS : W2K server) wich use the Internet connection sharing option of Windows to share an ADSL connection to 5 clients on a network. Everthing worked until I installed Norton Personal Firewall 2002. Now my server's Internet connection works but I cannot reach Internet from the clients computer

PS : My Internet Connection go through a VPN

thanks for your help