|Component:||Microsoft Exchange Message Transfer Agent|
|Message:||A directory error has occurred. Increase directory service logging levels and retry the operation. Error details will be found in the logged information. [<value> <value> <value> <value>] (12)|
By product design, the message transfer agent (MTA) relies on the directory service to initialize correctly. In Exchange 2000, MTA relies on the Categorizer to interface with Active Directory.
Check the Event Viewer for error and warning events that relate to Active Directory. Use Network Monitor to capture network traces, then view these traces from Network Monitor for any network issue. Stop and restart the Routing Engine.