I had this problem once before, but I cannot remember what I did to fix
it.  Try checking the rights on the passwd file though.  They should be: 
rw-r--r--

'just a thought...

> So I've got a database server at work that the users have never had to
> change passwords on. Now I need to make users change their passwords on
> this system, but when a user invokes passwd they get this error:
> passwd: Authentication token manipulation error
>
> This is before they even get the option to enter a new password, so it's
> not a case of too short or too simple. Also, I, as root, can change
> their password, but that is not how I want this to go.
>
> It should be noted that the passwd and shadow file have been copied to
> this system from the previous database server during an upgrade, and
> possibly from the server before that to the previous server, I can't
> remember that far back. That could be the root cause of the problem.
> I've tried backing up shadow and using pwconv to make a new shadow file,
> that didn't work either.
>
> Any thoughts from the list?
>
> Thanks,
> Josh
>
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