Dial-up Connection Issue

I have been totally unable to setup dial-in to my NT 4 server… The server answers and even seems to authenticate the user but the user can’t “see” anything or even “find” any server shares. Even if I sign in as the administrator, I can’t “see” anything. Funny thing is that I am able to browse the Internet from the local, dialed in PC which means I’m going thru the dialed connection thru to the server and out the server’s ISDN connection. ??? what am I missing…