How to Demote a Windows Domain Controller to a member server

How to Demote a Windows Domain Controller to a member server

In this blog post, I’ll show How to Demote a Windows Domain Controller to a member server.

Demoting a Windows Server domain controller Is a very common task In the lifecycle of every Active Directory Infrastructure and it’s something every Systems Administrator or Systems Engineer will have to do some day.

Saying that many admins are still keeping their old Windows Server DCs online because of they afraid they will break Active Directory when removing it, This post will show you how to do the right way and optimize your Infrastructure.

It’s a known that 80% of Active Directory replication and Health Issue are caused by old and unmanaged Domain Controller.

Before you start, make sure the items below are fulfilled before demoting your Domain Controller

  • You’ve moved the FSMO roles to another Server
  • You have at least two domain controllers in the forest
  • Active Directory Replication Is working 100%
  • The Domain Controller Is not the last DC In the forest

To complete this process, you will need to use a user account with Domain Admins permissions.

To get started, Logg into the Domain Controller with an admin user account and run the command below.

Dcpromo
How to Demote a Windows Domain Controller to a member server
How to Demote a Windows Domain Controller to a member server

This will start the Active Directory Domain Services Installation   Installation wizard

AD Domain Services Installation Wizard.
AD Domain Services Installation Wizard.

Click OK to confirm that the Server will no longer act a global catalog server

Click next

AD Domain Services Installation Wizard.
AD Domain Services Installation Wizard.

click next again and wait, this part can take a few minutes to complete

AD Domain Services Installation Wizard.
AD Domain Services Installation Wizard.

Click Finish and restart the Server

After restart log Into the Server and you will see that the server is now just a member server.

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