RRAS on Server 2003

can someone tell me why we lose internet connectivity when I enable RRAS?
Very stable system with RRAS normally disabled.
I need to reduce the dependency on 3rd party remote-connect programs.
All clients are WinXP SP2 or greater.

The minute I enable RRAS at the DC (Windows Server 2003 R2), all clients
lose internet connectivity.


ideas anyone?


thanks