VPN with server 2003 error

I upgraded a working win2k server (active directory PDC) to server 2003 with all updates.
My win2k RASS was working great until I upgraded to 2003 server (so I atleast know it was working and not a router problem) I can dial in and it connects and gives the corect set of ip's assigned.
I have 2 NIC installed
The RAS server is in the RAS IAS group
SO when you vpn in the router shows the incoming connection and goes to the assigned server to check username and password and fails with error 721.

I can access vpn locally (internally) I am using a linksys to port foward from a public to my private range.
the linksys befvp41 or something like that.
Are there anyother ports that might be different, I have 1723 and 47 what else could be the problem being that it use to work before the upgrade.....