Microsoft Knowledge Base Article 837361 contains the following summary and introduction:
SUMMARYThis article contains information about registry entries that relate to the Kerberos version 5 authentication protocol in Microsoft Windows Server 2003.
INTRODUCTIONKerberos is an authentication mechanism that is used to verify user or host identity. Kerberos is the preferred authentication method for services in Windows Server 2003.
If you are running Windows Server 2003, you can modify Kerberos parameters to help troubleshoot Kerberos authentication issues or to test the Kerberos protocol. To do this, add or modify the registry entries that are listed in the "More Information" section.
For additional information about Kerberos interoperability and authentication, click the following article number to view the article in the Microsoft Knowledge Base: