How do I change the password on an AD-bound Mac to match what's already in AD?
As I understand it, the correct way to change domain passwords should be kpasswd, which should update both local computer and domain passwords.
Note that I'm not in a position to test this right now, but something like:
&gt; kpasswd myusername@FULLADDOMAIN.COM
myusername@FULLADDOMAIN.COM's Password: 
New password for myusername@FULLADDOMAIN.COM: 
Verify password - New password for myusername@FULLADDOMAIN.COM: 
Success

I'll try and test this out and update this post.