Event ID - 138

Event Id138
DescriptionA directory error has occurred. Increase directory service logging levels and retry the operation. Error details will be found in the logged information. [valuevaluevaluevalue] (12)
Event InformationAccording to Microsoft:
By product design, the message transfer agent (MTA) relies on the directory service to initialize properly. In Exchange 2000, MTA relies on the Categorizer to interface with the Active Directory.
Check the Event Viewer for error and warning events related to the 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.
Reference LinksExchange (MSExchangeMTA)

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