Someone Manja AD - RAS Server

--- Someone familiar with the Active Directory more specifically the service RAS Server To a slight problem here. I have a W2k Server DC, and I'm configuring the RAS. What happens is this: When a RAS client attempts to connect the modem RAS Server, the modem handshake is not performing correctly, ie, and the connection is not being effected, the connection drops.
Anyone know what might be happening Modems are OK with configuration ..... ---

Install linux there and put a radius server to work with portslave that solves your problem!!

8)