[Samba] cannot change computer name

[aT]

This is a repeat post . I am waiting to hear from someone about this issue.
please help me resolving this issue.

> I have samba PDC configured.
>
> I am unable to change the computer name for any computer . All clients 
> are windows XP pro .
>
> It says access denied. Although i use the same Administrator username 
> and password which i used to join these computers to samba domain. I 
> will really appreciate if some can help me in this .
> thanks & regards
>
> I am using samba-server-3.0.13-2mdk
>
> Here is Global section of my samba conf
>
> [global]
>        server string = network Share
>        workgroup = NETPDC
>        netbios name = freeze
>        encrypt passwords = Yes
>        smb passwd file = /etc/samba/smbpasswd
>        passwd chat = *New*password* %n\n *new*password* %n\n *success*
>        passwd program = /usr/bin/passwd %u
>        passwd chat debug = yes
>        unix password sync = Yes
>        log level = 0
>        username map = /etc/samba/smbusers
>        syslog = 0
>        printcap name = CUPS
>        show add printer wizard = no
>        printing = CUPS
>        name resolve order = wins bcast hosts
>        add user script = /usr/sbin/useradd -m %u
>        delete user script = /usr/sbin/userdel -r %u
>        add group script = /usr/sbin/groupadd %g
>        delete group script = /usr/sbin/groupdel %g
>        add user to group script = /usr/sbin/usermod -G %g %u
>        add machine script = /usr/sbin/useradd -s /bin/false -d 
> /dev/null %u
>        logon script = scripts\login.bat
>        #logon home = \\%L\%U
>        #logon drive = X:
>        domain logons = Yes
>        preferred master =  Yes
>        wins support = Yes
>        winbind separator = \
>        idmap uid = 10000-20000
>        idmap gid = 10000-20000
> #       directory security mask = 0775
> #       security mask = 0775
> #       create mask = 0775
>        directory mode = 0775
>
>
>