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Windows NT 4.0 backup domain controller prevents the domain from installing in native mode

Windows Small Business Server 2003 Setup cannot continue because a backup domain controller running Windows NT Server 4.0 was detected on the network. As a result, the domain cannot be switched from mixed mode to the Windows 2000 native functional level during Setup.

The domain needs to be set to the Windows 2000 native functional level to support Windows Small Business Server tools, as this enables Active Directory features such as universal groups and nested group membership. This functional level requires that all domain controllers in the domain be running Windows 2000 Server or Windows Server 2003.

To continue Setup, you must upgrade the backup domain controller to run Windows 2000 Server with Service Pack 3 or later or Windows Server 2003, or you must remove it from the domain before completing Setup. After upgrading or removing the backup domain controller, click Check Again to refresh the list of Setup requirements.

ImportantImportant
If you continue without upgrading, Setup cannot successfully install the Administration component of Server Tools, and the organizational units and groups created by this component will not be available.
noteNote
If you choose to remove the backup domain controller, you will no longer have the backup domain controller functionality.
To remove the backup domain controller from the domain using Windows 2000 Server
  1. On a domain controller running Windows 2000 Server, click Start, and then click Run. In Open, type Srvmgr, and then click OK.

  2. Select the computer name for the backup domain controller.

  3. On the Computer menu, click Remove from Domain.

To remove the backup domain controller from the domain using Windows Server 2003
  1. On a domain controller running Windows Server 2003, click Start, and then click Run. In Open, type Dsa.msc, and then click OK.

  2. In the console tree, right-click the computer name for the backup domain controller, and then click Delete.

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