samba - Feb 2003 - cant access samba share with xp when domain password is different from samba password

I am running a win2k domain controller with many winxp and win2k workstations.
The samba server acts as a file storage area with samba 2.2.7.

I am encountering this problem when a winxp user changes his domain password,
he/she cant access the share anymore. Not even when the correct samba password
is entered when prompted. Somehow for winxp machines, domain and samba password
has to be the same. Win2k machines do not face this problem and works fine. Need
some help or suggestions on this. Thanks in advcance.

Below is my smb.conf


[global]
        workgroup = workgroup
        server string = samba server
        encrypt passwords = Yes
        obey pam restrictions = 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
        admin log = Yes
        log level = 1
        log file = /var/log/samba/%m.log
        max log size = 0
        socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
        preferred master = No
        domain master = No
        dns proxy = No
        wins server = dc1
        guest account = 
        printing = lprng

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

[Finished_Work]
        path = /directory to share
        valid users = valid users
        force group = users
        read only = No
        create mask = 0775
        directory mask = 0775