if the Dcpromo command failed use the command
> dcpromo /forceremoval
or
You have to remove a Domain Controller server manually
> dcpromo /forceremoval
or
You have to remove a Domain Controller server manually
Step 1: Cleaning up metadata via Active Directory Users and Computers
- Log in to DC server as Domain/Enterprise administrator and navigate to Server Manager > Tools > Active Directory Users and Computers
- Expand the Domain > Domain Controllers
- Right click on the DC server that need to remove manually and click delete
- In next dialog box, click yes to confirm
- In next dialog box, select This Domain Controller is permanently offline and can no longer be demoted using the Active Directory Domain Services Installation Wizard (DCPROMO) and click Delete
- If the domain controller is global catalog server, in next window click yes to continue with deletion
- If the domain controller holds any FSMO roles in next window, click ok to move them to the domain controller which is available
Step 2: Cleaning up the DC server instance from the Active Directory Sites and Services
- Go to Server manager > Tools > Active Directory Sites and Services
- Expand the Sites and go to the server which need to remove
- Right click and click Delete
- In next window click yes to confirm
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