Receive connector %1 rejected an incoming connection from IP address %3. The maximum number of connections per source (%2) for this connector has been reached by this source IP address.

Details
Product: Exchange
Event ID: 1021
Source: MSExchangeTransport
Version: 8.0
Symbolic Name: SmtpReceiveMaxConnectionPerSourceReached
Message: Receive connector %1 rejected an incoming connection from IP address %3. The maximum number of connections per source (%2) for this connector has been reached by this source IP address.
   
Explanation

This Warning event indicates that a remote messaging server that is using the specified Receive connector has reached the maximum number of simultaneous incoming connections that the Receive connector can accept from a single IP address. This value is specified by the MaxInboundConnectionPerSource parameter on the Receive connector. The default value is 100.

   
User Action

To resolve this warning, increase the value of the MaxInboundConnectionPerSource 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 10000. To disable the inbound connection per source limit on a Receive connector, enter a value of unlimited.

For more information, see Set-ReceiveConnector.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

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