Topic Last Modified: 2010-07-06

The Microsoft Exchange Server 2010 Management Pack for System Center Operations Manager monitors the Windows Application log on computers running Exchange 2010 and generates this alert when the events specified in the following Details table are logged.

To learn more about this alert, in Operations Manager, do one or more of the following:

From the Operations Console, double-click this alert, and then click the General tab. Review the description of the alert that includes the variables specific to your environment.
From the Operations Console, double-click this alert, and then click the Alert Context tab. Review the logged events that meet the criteria of this Operations Manager alert.

Details

Product Name	Exchange
Product Version	14.0 (Exchange 2010)
Event ID	1021
Event Source	MSExchangeTransport
Alert Type	Warning
Rule Path	Microsoft Exchange Server/Exchange 2010/Common Components/Hub Transport and Edge Transport/Transport
Rule Name	SMTP Connector rejected an incoming connection - the maximum number of connections has been reached - MSExchange Transport 1021.

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.

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.

For More Information

If you are not already doing so, consider running the Exchange tools created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.