Donate Us : Demote a Domain Controller in Windows Server 2008 R2 1. Prepare - DC1 : Domain Controller ( ) - DC2 : Additional Domain Controller ( ) 2. Step by step : Demote DC2 - DC1 : Check Domain Controllers + Start - Administrative Tools - Active Directory Users and Computers - - Domain Controllers Contain - DC2 : Demote Domain Controller + Start - dcpromo - Next to Administrator Password : Enter password and confirm - Finish - Restart Now + Server Manager - Roles - Remove Roles - Server Roles : Uncheck "Active Directory Domain Services" - Remove - Close - Restart - DC1 : Check Domain Controllers again + Active Directory Users and Computers - - Domain Controllers Contain === Only DC1 === OK