Microsoft KB Archive/251177

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Knowledge Base

XADM: Error Message: You Must Be Logged Into an NT Domain to Run Microsoft Exchange Server Setup

Article ID: 251177

Article Last Modified on 2/21/2007


  • Microsoft Exchange Server 5.5 Standard Edition
  • Microsoft Windows 2000 Standard Edition

This article was previously published under Q251177

IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry


While you are attempting to install Microsoft Exchange Server on a Windows 2000 Server-based computer, you may receive the following error message:

You must be logged into an NT domain to run Microsoft Exchange Server Setup.

This error can also occur if you are installing a new service pack through a terminal server session on a member server in a NT domain.


To attempt to work around this behavior:

  • Ensure that you are logged on to the server with a domain account, not a local account.
  • If this does not correct the behavior, check the following registry key:WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
    1. Start Registry Editor (Regedt32.exe).
    2. Locate the DefaultDomainName value under the following key in the registry:


    3. If DefaultDomainName is set to the local computer name, change it to the domain name that the computer account is in, and then try to install Exchange Server again.
    4. Quit Registry Editor.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Additional query words: fail failed

Keywords: kbbug kbnofix KB251177