[Samba] Cannot change password!!!

[Elliot]

Hi guys.. I need your help.


I have managed to setup samba as a pdc for my  windows clients to
connect to it.. They are all using w2k proffesional.it seems that i
cannot change my password from my w2k professional client when using
samba as a pdc 

.... can anyone pls help me?????????? 

it keeps saying that old password is wrong .. when if fact it is not.
This Is my smb.conf .. I am running samba 2.2.5 with linux mandrake 8.2



[global]
        path = /home
        log file = /var/log/samba-log.
        domain master = yes
        add user script = /usr/sbin/useradd -d /dev/null -g 100 -s
/bin/false -M %$
        encrypt passwords = yes
        logon path = \\%L\profiles\%U
        socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=8192
        max log size = 50
        hosts allow = 192.168.1.
        preferred master = yes
        logon script = netlogon.bat
        smb passwd file = /usr/local/samba/private/smbpasswd
        passwd chat = *new password*%n\n *new password*%n\n *changed*
        passwd chat debug = false
        passwd program = /usr/bin/passwd %u
        unix password sync = true
        null passwords = yes
        security = user
        domain logons = yes
        log level = 2
        workgroup = domain_sg
        server string = Samba PDC running %v
        local master = yes
        netbios name = aries
        logon drive = H:
        os level = 33
        logon home = \\%L\%U/.profile