Users cannot change password.

This error shows when trying to change one.
A network service error has occurred.

Changing the password in the admin panel shows an error too:
Message: system failure: change password listener sambapassword for account xxxxxxxxxx@mydomain.com not found Error code: service.FAILURE Method: [unknown] Details:soap:Receiver

I searched the internet but threads are old and may not be applicable.

Someone please help me.

Running on zimbra 7.1.3, just upgraded from 5.0.7