[Samba] changing domain user passwd from linux box

[Kashif Awan]

Hello everyone
I have installed samba-3.0.2 on RH AS 2.1 and joined
it to active directory domain and also configured
winibind. I can access shares on box linux and windows
pc,s and my domain users are successfully loging on to
linux box but when I domain users wants to changes it
active directory passwd using passwd command this
erros is returned

passwd:Authentication token manipulation error

does anybody know what could be the possible reason
for this error.
Regards

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