This rule is designed to catch all unknown Security Accounts Manager (SAM) errors. Errors that are caught by this rule may have been added to the operating system after this Management Pack was released.
The most likely cause is that the domain controller has been upgraded with a service pack, hotfix, or operating system upgrade, and the Active Directory Management Pack has not been upgraded.
To upgrade to the latest version of the Active Directory Management Pack, see the Management Pack Catalog at http://go.microsoft.com/fwlink/?LinkId=82131.
Microsoft Help and Support for Microsoft Windows Server 2003
Microsoft Knowledge Base