It looks like the problem is at least 3 years old :(
http://lists.samba.org/pipermail/samba-ntdom/1999-June/038848.html
Yura Pismerov wrote:> 
>         Did anybody get to work password change enforcement with Samba PDC
> running LDAP ?
> It looks like it is "semi-working". I was able to enforce
password
> change with USRMGR, but now it keeps asking me for the password change
> every time. I checked the pwdMustChange attribute and it is still set to
> 0 for some reason (hence checkbox for the password change enforcement in
> USRMGR is still checked and I am not able to unchek it). Is it known
> issue and I can't use USRMGR for that purpose ?
> 
>         TIA.
> 
> P.S. I run Samba 2.2.5
> 
> --
> 
> Yuri Pismerov, Sr. System Administrator,
> TUCOWS.COM INC. (416) 535-0123  ext. 1352
> 
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-- 
Yuri Pismerov, Sr. System Administrator, 
TUCOWS.COM INC.	(416) 535-0123  ext. 1352