On Master side, the following connector’s linkstate is down.Process Id: %1Process location: %2ConnectorDN: %3

Details
Product: Exchange
Event ID: 974
Source: MSExchangeActiveSyncNotify
Version: 6.5.0000.0
Message: On Master side, the following connector’s linkstate is down.Process Id: %1Process location: %2ConnectorDN: %3
   
Explanation
A Simple Mail Transport Protocol/Routing Group (SMTP/RG) connector may go into a “down” state temporarily, and then change within a minute to an “up” state after Advanced Queuing (AQ) retries the connector and determines that the SMTP/RG service on the target server is responding. This issue can occur if an SMTP/RG server on the other side does not close the connection properly. When a connector is in a down state, AQ flags the connector to indicate that it is in an error state. This type of connector state toggling can occur many times in an hour.

While this event may appear even when things are functioning normally (as explained above), it may also happen if the local server is unable to resolve the FQDN of the remote server that is part of the routing group.

   
User Action
If you see this event occasionally and mail-flow is fine, then this is not a cause for worry. If you see this repeatedly, and you see mails getting stuck in the message queues, then you need to investigate further. Look at other related events in the application and system logs that may give a clue to the problem. Ensure that the connector is correctly configured. Ensure that network connectivity between the servers of the routing groups is good and stable.

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