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Event ID: 2124 Source: MSExchangeADAccess

Level
Description
Process <process> (PID=<PID>). Domain controller <DC> was not found when DNS was queried for the service location (SRV) resource records for domain <domain>
The query was for the SRV record for <DC>
The following domain controllers were identified by the query:
<DC>
Common causes of this error include the following:
- The DNS SRV records required to locate a domain controller for the domain are not registered in DNS. These records are registered with a DNS server automatically when a domain controller is added to a domain. They are updated by the domain controller at set intervals. This computer is configured to use DNS servers with following IP addresses:
<IP address>
- One or more of the following zones do not include delegation to its child zone:
<zone>.
Comments
 
As per Microsoft: "This event indicates that Domain Name System (DNS) service (SRV) records for the specified domain controller cannot be found. The specified domain controller will not be used by ADAccess. As long as there is sufficient capacity in suitable domain controllers, there is no mail flow interruption". See MSEX2K3DB to troubleshoot this problem.

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