Logging into Domain via VPN/RAS Server

First Congfiguration: 98SE desktop PPTP’ing into RAS VPN on NT 4.0 BDC with SP6A, via a Internet Dialup connection.
Question: I get a “No domain is available to validate your password” error when trying to get credentials on the network. but it does allow me into the RAS Server, which is using the User base shared by the PDC.

Any suggestions on how to get the domain server to validate the user?