![]() If the cmdlet returns Success, you may move on. Use the Test-ADDSDomainControllerUninstallation cmdlet to make sure if there are any dependencies or issues you may come across when removing a DC.If other services (like a KMS server, Radius/NPS, WSUS, etc.) are running on the domain controller, decide whether you want to move them to other hosts.If a Certificate Authority role is running on the domain controller, migrate it to another server.Here is a detailed article: How to Audit Client DNS Queries in Windows Server It is easier to find such devices accessing your DNS server by its logs. You need to find such devices and reconfigure them to another DNS server. Some clients may be manually set to use a DNS server on the DC (network devices, servers, printers, scanners, etc.). ![]() You can display a list of DNS servers set for all zones ( DNS Servers Option 006) on a server using the following PowerShell command (learn more about how to manage DHCP in Windows Server using PowerShell): Get-DhcpServerv4Scope -ComputerName | Get-DhcpServerv4OptionValue | Where-Object | FT Value Change the configuration of the DHCP scopes so that they assign a different DNS server address (wait for the IP lease time to expire so that all clients get new DNS server settings). Change DNS settings for the DHCP scopes that are assigning IP addresses to the clients.Make sure that the DHCP server role is not running on the domain controller.Make sure that the AD FSMO roles are not running on the domain controller: netdom query fsmo If needed, move the FSMO roles to another DC.To display a list of errors on a specific domain controller, run the following command: dcdiag.exe /s:mun-dc03 /q There is a separate article on how to check a domain controller’s health and replication in AD using dcdiag, repadmin, and PowerShell scripts. Check the state of your domain controller, Active Directory, and replication.If you are going to decommission one of your AD domain controllers (common DC or read-only domain controller – RODC), you have to take some preparatory steps before demoting your domain controller to a member server and removing the Active Directory Domain Services (ADDS) role. Removing an Active Directory Domain Controller and ADDS Role (Step-by-Step) How to Remove a Failed Domain Controller in Active Directory?.Removing an Active Directory Domain Controller and ADDS Role (Step-by-Step).
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