Event ID - 974

Event Id974
DescriptionOn Master side, the following connectors linkstate is down.Process Id: <id>Process location: <file name>ConnectorDN: <connector name>
Event InformationAccording to Microsoft:

A Simple Mail Transfer 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 occur even when everything is functioning normally (as explained above), it may also occur if the local server is unable to resolve the fully qualified domain name (FQDN) of the remote server that is part of the routing group.
User Action :
If you see this event occasionally and mail-flow is alright, then this is not a cause for concern. If you see this repeatedly, and you see mails getting stuck in the message queues, then you need to investigate further. Check for related events in the application and system logs that may provide information about the problem. Ensure that the connector is correctly configured. Ensure that network connectivity between the servers of the routing groups is good and stable.
Reference LinksOn Master side, the following connectors linkstate is down.Process Id: id Process location: file name ConnectorDN: connector name

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