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Event ID: 2104 Source: MSExchangeDSAccess

Level
Description
Process <process> (<PID>). All the DS Servers in domain are not responding.
Comments
 
This event can occur if the domain controllers in local or all domains become unreachable because of network problems. Use the Ping or PathPing command-line tools to test network connectivity to local domain controllers. Run the Dcdiag command line tool to test domain controller health.
As per Microsoft: "This can happen if the DC or DCs in question become unreachable because of a network problem". See MSEX2K3DB for additional information about this event.
See ME842116 for information on this event.
Process: MAD.EXE - As per ME322837, this event can be ignored if they occur after you apply Service Pack 2 for Exchange 2000 Server. Check ME312859 for more details.

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