Option 2 MSConfig Open MSConfig.msc, go to the Boot tab, click Safeboot, and ActiveDirectoryRepair. It doesn't appear to happen after every reboot, but something is clearly putting into DSRM mode. Repair Active Directory by Using ESENTUTL Option 1 F8 Reboot the machine and press F8 during start-up and wait for the prompt to select DSRM. I realise that the Server will boot into DSRM mode if a restore is performed, however we have not performed a restore of the domain controller and indeed never have to date, so I'm unsure why this keeps happening. We can't figure out however why it occasionally does this, and we are wondering if it is something to do with the Veeam backup. Once this is done we can safely reboot the Server and it boots up as normal. Unchecking Safe boot and changing the startup selection from selective startup to normal startup does not remove the safe boot option and we have to run bcdedit /deletevalue safeboot to remove the flag. When rebooting the domain controller we have to be careful to check the boot options in msconfig, because we often find that the Server is set to Safe boot in Active Directory repair mode. Occasionally we see the error "ErrorL VSSControl: Failed to prepare guest for freeze", and the only solution to this is to reboot the domain controller and run the backup again - after which the backup of the domain controller completes successfully. We have a virtual domain controller (Windows Server 2012) that is backed up by Veeam every evening.
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