RAS Problems

I have RAS set up on an NT4.0 SBS. I can call in from a WIN98 machine and make a connection. The RAS admin screen shows me as logged on, and the client sees the login as successful but I can not see the server or map a drive from the client. I canping the server name and tracert returns the server name. I have everything in the hosts file correctly. I have dial-in permissions and have tried both “Entire network” and “This machine only” settings. IP addresses are correct and domain names match. Any ideas ???