Reset Active Directory Restore Mode password
Maybe the most forgotten password is the one for Directory Services Restore Mode (DSRM) because it’s created only when a DC is built, and used only during critical DC recovery operations, which hopefully does not happen very often. Not knowing this password can prevent a successful recovery.
If you don’t know your DSRM password and haven’t stored them in a safe place, use the following commands for each Domain Controller to reset it to a known value:
ntdsutil
set dsrm password
reset password on server {servername}
Once you do this, write down that password and lock/encrypt it away.

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