Demoting a DC
Admin Credentials
Move all FSMO roles the logged-on user should be a member of the Enterprise Administrators group. This is required to transfer Schema master or Domain naming master roles.
The rest of the operations can be done with a user who is a member of the Domain Administrators group.
The most important things to look out for are the following components that are either running or registered against the system:
Global Catalog
FSMO Roles
Bridgehead server
General server checks
You have enterprise admin credentials
Global Catalog
To check what servers are functioning as a Domain Controller in your domain, type the following command:
dsquery server -domain #DomainName# | dsget server -isgc -dnsname
replace #DomainName# with the domain of the DC that you are demoting
If you have more than just the DC that you are preparing the demote, then you have nothing else to do as the DCPROMO steps will remove it automatically. If you don’t have any more, follow MS article 296882 to make another DC a...