[Samba] Samba 3.5.6 Syncing passwords

[Enrique Ayesta Perojo]

Hello,

I'm running a Samba 3.5.6 standalone server on FreeBSD 8.1, with XP and 7 
clients. I can't get Samba to syncronize Windows & NIS passwords, in fact 
it's behaving strangely from what i think:

Relevant (i think) parts of smb.conf:

encrypt passwords = yes
passdb backend = tdbsam
pam password change = yes
unix password sync = yes
passwd program = /usr/bin/passwd '%u'
passwd chat = *New*password* %n\n *ReType*new*password* %n\n 
*passwd*changed*\n

When 'pam password change' is set to 'yes' a user can change his windows 
password, if not the UNIX NIS password is changed, but not the Windows one, 
and it says the user can't change it...

I have not made any modifications to my pam configuration, so... any clue? Is 
it posible to sync passwords or just one of them can be changed by the user 
from Windows?

Thanks