When you hold down the SHIFT key, right-click an executable file, press Run as, and enter a valid user name and password on a Windows 2000 domain controller, you receive:
Unable to logon:
Logon failure: unknown user name or bad password.
You failed to notice that the Domain: box in the dialog contains the local computer name and NOT the domain name.
To workaround this issue, clear the computer name and type the domain name.