How to Rename a Domain Controller using netdom

If you manage a Windows Server VPS with us and it’s running as a domain controller, you may occasionally need to rename it – for example after a rebrand, or to bring naming in line with a standard. Renaming a domain controller (DC) is riskier than renaming an ordinary server, because other machines and services rely on its name to find it. This guide covers the safe way to do it using Microsoft’s own netdom tool.

Before you start: only attempt this on a healthy domain, and check Active Directory replication is working correctly first (run dcdiag and repadmin /replsummary and confirm both come back clean). If you have more than one domain controller, test the process on a non-production DC first if at all possible.

Preparation

• This guide assumes you are running Windows Server 2012 R2, 2016, or 2019
• You have confirmed Active Directory replication is currently healthy
• You want to rename your DC

Renaming your DC using netdom

Step 1: Open Command Prompt

Open Command Prompt as a domain administrator:

1. Open the Start Menu
2. Type CMD
3. Right-click on Command Prompt
4. Select Run as administrator

Step 2: Add the new name to your DC using netdom

Enter the following command, replacing the computer names to suit your environment. Use the fully qualified domain name (FQDN) at every stage of this guide.

netdom computername CURRENTNAME.DOMAIN.LOCAL /add:NEWNAME.DOMAIN.LOCAL

If the command was successful you should receive the following message: Added (NAME) as an alternate name for the computer. The command completed successfully.

Step 3: Verify the name was added successfully

To confirm the new name was added correctly, enter the following command. Use the current name of the computer, not the new name you just added.

netdom computername CURRENTNAME.DOMAIN.LOCAL /enumerate

If this was successful, you should see both names appear in the list.

Step 4: Change the primary DC name

Enter the following command to change the additional computer name to primary:

netdom computername CURRENTNAME.DOMAIN.LOCAL /makeprimary:NEWNAME.DOMAIN.LOCAL

You should receive a message stating that the change was successful and that you should now reboot the server.

Step 5: Reboot your server

Reboot your server either from the Start Menu, or by entering shutdown /r /t 0 into the Command Prompt window.

Step 6: Verify the name change

Once your server has rebooted, open Command Prompt again and enter the following command using your new computer name – again, you should see both names in the list.

netdom computername NEWNAME.DOMAIN.LOCAL /enumerate

Step 7: Remove the old hostname

Once you’ve verified that your computer responds to the new hostname, remove the old name:

netdom computername NEWNAME.DOMAIN.LOCAL /remove:OLDNAME.DOMAIN.LOCAL

Step 8: Check for issues

Run the following command to confirm everything on your DC is functioning correctly:

dcdiag

If dcdiag reports any errors, resolve them before considering the rename complete – don’t leave a DC in a partially-renamed state. If you’re not confident diagnosing an AD error, our support team can help.