I'm sure there is a fairly simple explanation for this but why is it possible to join a Windows Server 2003 computer to a Windows 2000 AD Domain when supplying a blank username and password. When you click Change to open the Computer Name Change dialog and type in the domain that you want to join, it prompts you for a user account that has permissions to join the computer to the domain. I click OK without supplying a user and password and the server joined the domain successfully. I don't see how this happened or how it is possible. Is it a group policy setting on the Domain Controller that is not set up correctly or what? Any advice would be great on this.