[Samba] Password sync problem from unix to windows

[SoUnD WrEcK]

I have searched the list and have been unable to find a definitive answer to
this problem.

I am using Samba 3.0.2xx as a PDC.  The server that runs this also happens
to be a NIS master (not sure if this complicates matters or not).

When a user's password is changed within a windows client that is part of
this domain (i.e. using ctrl-alt-del), the password change correctly
propagates to the unix side.

However, if a user's password is changed from the unix side (i.e. using
/usr/bin/passwd), this does not propagate correctly to the windows side.
This appears to be some sort of Samba password syncing problem.

Here are some relevant lines from my smb.conf (NOTE: The encrypt passwords
line is commented out and not exactly sure why that's there or if this is my
problem.)

-----
   ;encrypt passwords = no

   unix password sync = yes
   passwd program = /usr/bin/passwd %u
   passwd chat = *New*password:* %n\n\
                 *Re-enter*new*password:* %n\n\
                 *passwd:*password*successfully*changed*for* %u
-----

My main question here is whether or not this can be done- can I sync
passwords if the password was changed from the unix side?

One thing I read was that user's must use the smbpasswd command instead of
passwd.  Would this be an acceptable solution?  If so, could I reroute
(symlink) /usr/bin/passwd to smbpasswd so that users would be forced to use
smbpasswd?  I'm not really sure of another way to enforce this..

Thanks in advance for your advice.

Renee