- The Microsoft Exchange System Attendant stops responding.
- The Microsoft Exchange System Attendant service does not automatically start when you restart the computer.
- The following event ID message is logged in the Application event log of the Event Viewer:Event Type:Error
Description: Unexpected error An unknown error has occurred. ID no: 80040a01 Microsoft Exchange System Attendant occurred.
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The "0x80040a01" error that is noted in the "Description" section of Event ID 1005 is a "timeout for topology creation" error. When Exchange server services start, the Exchange server services must contact a domain controller to read configuration information from Active Directory. If a domain controller and a global catalog is unavailable, or cannot be contacted, the Exchange server services cannot start. This is because of topology creation (DSAccess) changes in Exchange server.
Contact your network switch hardware vendor for more information about how to turn on this configuration setting.
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