Event ID - 1009

Event Id1009
SourceMSExchangeTransport
DescriptionReceive connector %1 rejected an incoming connection. The maximum number of connections (%2) for this connector has been reached.
Event InformationAccording to Microsoft :
Cause :
This Warning event indicates that a Receive connector has reached the maximum permitted number of simultaneous incoming connections. This value is specified by the MaxInboundConnection parameter on the Receive connector. The default value is 5000.
Resolution :
To resolve this warning, increase the value of the MaxInboundConnection parameter on the Receive connector by using the Set-ReceiveConnector cmdlet in the Exchange Management Shell. The valid input range for this parameter is 1 to 2147483647. To disable the inbound connection limit on a Receive connector, enter a value of unlimited.
Reference LinksEvent ID 1009 from Source MSExchangeTransport

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