Changing a domain controller on a Windows server involves transferring or seizing the FSMO (Flexible Single Master Operations) roles and updating the network settings to recognize the new domain controller. Below is an outline of steps you can take to achieve this. However, these steps should be performed by an experienced IT professional as they can impact your network functionality.

1. Preparing the New Domain Controller

– Install Windows Server on the new server.

– Promote the server to a domain controller using the Active Directory Domain Services Configuration Wizard.

– Install any necessary services such as DNS, DHCP, etc., on the new domain controller.

2. Transferring FSMO Roles

– Log onto the current primary domain controller.

– Open the Active Directory Users and Computers snap-in. Right-click your domain and select “Operations Masters.”

– In each tab, change the role holder to the new domain controller.

– Repeat for other FSMO roles found in Active Directory Domains and Trusts, and Active Directory Schema snap-ins if applicable.

3. Updating DNS Settings

– On your DNS servers, update the DNS records to point to the new domain controller’s IP address.

– Update any DHCP scopes to point clients to the new DNS server accordingly.

4. Replication

– Ensure all changes have been replicated throughout all domain controllers within your domain.

5. Testing

– After transferring roles and updating settings, thoroughly test that authentication processes, DNS resolution, and Active Directory services are functioning correctly with respect to the new domain controller.

6. Demoting Old Domain Controller (Optional)

– If you are replacing an old DC, demote it using Server Manager or PowerShell commands (`Uninstall-ADDSDomainController`).

7. Finalization

– Update any documentation with information about your new domain controller.

– Monitor logs for any errors and ensure backups are being performed correctly.

This procedure is a broad overview and does not cover all potential complexities involved in changing a domain controller. Consider consulting with Microsoft’s official documentation or seeking professional assistance to ensure a smooth transition.