The connector rejected an incoming connection because the maximum number of connections has been reached


Topic Last Modified: 2007-11-16

The Microsoft Exchange Server 2007 Management Pack for Operations Manager monitors the Windows Application log on computers that are running Exchange Server 2007 and generates this alert when the event or events specified in the following Details table are logged.

To learn more about this event, do one or more of the following:

  • Review the description of the event that includes the variables specific to your environment. From the Operator Console, select this alert, and then click the Properties tab.

  • Review all events that have been logged that meet the criteria of this Operations Manager alert. From the Operator Console, click the Events tab, and then double-click the event in the list for which you want to review the event description.


Product Name


Product Version

8.0 (Exchange Server 2007)

Event ID


Event Source


Alert Type


MOM Rule Path

Microsoft Exchange Server/Exchange 2007/Common Components/Hub Transport and Edge Transport/Transport

MOM Rule Name

The connector rejected an incoming connection because the maximum number of connections has been reached.


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.

For More Information

To search the Microsoft Knowledge Base articles based on criteria that generated this alert, visit the Search the Support Knowledge Base (KB) Web site.

To review Exchange 2007 event message articles that may not be represented by Exchange 2007 alerts, see the Events and Errors Message Center.

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.