samba - Dec 2003 - Samba 3.0 PDC + win2000 client

Hi,

I have been trying to get my win2000 clients to re-join our DOMAIN since
upgrading to 3.0 I can access smb shares with 'NET USE ....' no problem
but when trying to change win2000 from workgroup to domain it asks for
use & password - this always fails with :- 
"login failed: unknown user or bad password"  what could be the
problem now ?

TIA,
	Frank.

# Global parameters
[global]
        workgroup = DDI
        server string = Samba Server
        update encrypted = Yes
        pam password change = Yes
        passwd program = /usr/bin/passwd %u
        passwd chat = *New*password* %n\n *Retype*new*password* %n\n 
*passwd:*all*authentication*tokens*updated*successfully*
        unix password sync = Yes
        log level = 3
        log file = /var/log/samba/%m.log
        max log size = 0
        time server = Yes
        socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
        domain logons = Yes
        os level = 65
        preferred master = Yes
        domain master = Yes
        wins support = Yes
        ldap ssl = no
        remote announce = 192.168.1.255
        create mask = 0777
        hosts allow = 192.168.1., 127., 192.168.2., 192.168.3., 192.168.4., 
192.168.5.
        printing = lprng