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
Dcpromo builds two log files (Dcpromoui.Log and Dcpromo.log) in the %SystemRoot%\Debug folder on Windows 2000-based servers. Both files are useful for troubleshooting problems with the promotion or demotion of Active Directory servers.
This article describes registry settings that control the log detail in the Dcpromoui.log file.