Directory Services Restore Mode (DSRM) is a safe mode boot option for Windows Server domain controllers. DSRM allows an administrator to repair or recover to repair or restore an Active Directory database.
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When Active Directory is installed, the install wizard prompts the administrator to choose a DSRM password. This password provides the administrator with a back door to the database in case something goes wrong later on, but it does not provide access to the domain or to any services. In the event a DSRM password is forgotten, it can be changed by using the command-line tool NTDSUtil.