Samba/NT4.0Client problem

[Rodrigo Andres Benzaquen]

Hi, I have Samba 2.0.7 running in RedHat 6.2. My clients use Windows NT 4.0
. I have the Samba configured as PDC. When I try to connect the NT client to
the PDC I receive the following error :

Unable to connect to the domain controler for this domain. Have you
administrator check your computer account on the domain
The NT computer name is BENZAROD

in the smbpasswd I have the Computer name "BENZAROD$:55"

in the /etc/passwd: benzarod$:x:564:502:NTmachine:/dev/null:/bin/false
in the /etc/group : smb:*:502:


What I'm doing wrong ?
Thanks
Rodrigo