After demoting a domain controller, the related event logs (DNS Server, File Replication Service, and Directory Service) are not removed. While this is technically not an issue, it can potentially confuse monitoring systems (SCOM inadvertently detects a DNS server while there is none). Or, perhaps you should want to be tidy.

Open regedit.

Navigate to:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Eventlog

This key contains a subkey, one for each event log. Remove the following keys to remove the event logs:Directory Service

File Replication Service

DNS Server

You do not need to reboot the server. The logs are immediately removed from the Event Viewer.

Although the change is effe  ...