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Event ID: 2091 Source: MSExchangeDSAccess

Level
Description
Process <process name> (PID=<process id>). DS Server name specified in the registry (<distinguished name>) was not found in the Sites container in the Active Directory. DSAccess will not use this server as a Domain Controller or Global Catalog.
Comments
 
As per Microsoft: "This event indicates that the domain controllers or global catalog servers specified by the registry keys do not exist. DSAccess will not revert to the standard mechanism of automatic topology discovery, so if all domain controllers or global catalog servers in the registry are nonexistent, this can result in services startup failure or halting of mail flow, so it should be investigated immediately". See MSEX2K3DB for more details.

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