Unable to join samba PDC

[Gabriele Verzeletti]

  Hi all (and sorry for my poor english :) )

Samba server:
     Red Hat Linux 9.0
     samba-3.0.7-1_rh9.i386.rpm

Client:
     Windows 2000 AS (V 5.0 Build 2195: Service Pack 4)

smb.conf:
[global]
         workgroup = SAMBA.LAN
         netbios name = SAMBSRV
         encrypt passwords = yes
         domain master = yes
         local master = yes
         preferred master = yes
         os level = 65
         security = user
         domain logons = yes
         logon path = \\%L\profiles\%u\%m
         logon script = logon.bat
         logon drive = H:
         logon home = \\%L\%u\.win_profile\%m
         log file = /var/log/samba/log.%m
         log level = 2
         max log size = 50
         dns proxy = No
         admin users = root
         passdb backend = tdbsam
         add user script = /usr/sbin/useradd -d /dev/null -g 100 -s 
/bin/false -M %u

[homes]
         comment = Home Directories
         read only = No
         browseable = No

[printers]
         comment = All Printers
         path = /usr/spool/samba
         printable = Yes
         browseable = No

[profiles]
         path = /usr/local/samba/profiles
         browsable = no
         writable = yes
         create mask = 0666
         directory mask = 0700

[netlogon]
         path = /usr/local/samba/netlogon
         writable = no
         browsable = no

drwxrwxrwx    2 root    root         /usr/local/samba/profiles
drwxrwxrwx    2 root    root         /usr/local/samba/netlogon

smbpasswd -a root
smbpasswd -a myuser
smbpasswd -am myworkstation

myworkstation join the domain without problem, upon rebootin and 
attempting to logon to the domain i get the following error:
"The system cannot log you on to this domain because the system's 
computer account in its primary domain is missing or the password on 
that account is incorrect"

Thx to all for any help !

Gab