Password writeback is a feature of Microsoft Entra Connect. It ensures that when a password changes in Microsoft Entra ID (password change, self-service password reset, or an administrative change to a user password) it is written back to the local Active Directory (AD) – if it meets the on-premises AD password policy.
Technically, a password writeback operation is a password “reset” action. Password writeback removes the need to set up an on-premises solution for users to reset their password. It all happens in real time, so users are notified immediately if their password cannot be reset or changed for any reason.
It can be enabled with password hash synchronization (PHS) meaning that a cloud password change is first written back (as a hash) to on-premises AD and then forwarded (as a hash of a hash) to the cloud. It can be enabled with pass-through authentication (PTA)meaning that a cloud password change need not be written to the cloud at all.
Find out more about pass-through authentication on our Microsoft Entra Connect Masterclass.
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