One of my friends upgraded its server from NT 4 to Win 2000 server. It is the ONLY domain controller of the entire network. I do not know what he did, but the domain controller got a period "." in the computer name. This is causing the active directory to behave intermittently. It is not allowing an additional domain controller to replicate the data (because the new computer is unable to find main domain controller). How can the domain contriller be renamed without losing the active directory information? Microsoft's article "How to Rename a Windows 2000 Domain Controller (Q296592)" is also of no use as I am unable to contact the main domain controller.