NT PDC, Samba, Linux with Red Hat 6.1

I have setup a WIN NT 4.0 Server as a PDC and a Linux server running Samba. From a WIN NT 4.0 workstation I try to log in to the Linux server and get the message that Username and or Password not reginized. I have setup Samba to use the NT user info from the domain. Not sure what info I should post, let me know what you are looking for and I will post it. Any suggestions will be greatly appreciated.