Configuring Samba for Windows Domains Logons

[linux]

I need help on my Red Hat 7.1 - configurating my Linux Server to be a Domain
Controller.  My workstations are Windows 2000 professional and 98.  I used
the work setup in the SMB.CONF and it works fine.  

But when I set it up as the book said - I can't get through the password.
It comes up with this error " The procedure is out of range".

So what is the trick and setup procedures.  Please help me.  I have the
Samba Book, O'Reilly by Robert Eckstein. 

Thanks!  Linux all the way.