The connector rejected an incoming connection because the maximum number of connections has been reached on Exchange 2007

After releasing some false negatives (blocked email on a antispam server, that shouldn’t be marked as spam), I received the following email message from our SCOM server (System Center Operations Manager)

Alert: The connector rejected an incoming connection because the maximum number of connections has been reached.
Last modified by: System
Last modified time: 2/5/2010 1:58:47 PM
Alert description: Receive connector Relayer xyz rejected an incoming connection from IP address 10.254.4.12. The maximum number of connections per source (20) for this connector has been reached by this source IP address.

Apparently, I released more than 20 email messages at a time. My Exchange server is configured to allow no more than 20 connections at a time per source.

To make sure this problem won’t come back again, I raised the maximum number of connections per source. To do so, follow these steps.

  1. Open an Exchange Management Shell (Powershell with the Exchange snap-in)
  2. Type get-receiveconnector. This lists all connectors of your Exchange environment
  3. Type get-receiveconnector -id “unique receive connector name” | fl to get a overview of all the settings of that receive connector. To find out what receive connector you need to query, refer to the email you received from SCOM
  4. Look for MaxInboundConnectionPerSource in the overview. Here you’ll find the current setting.
  5. To adjust the MaxInboundConnectionPerSource, type set-receiveconnector -id “unique receive connector name” -MaxInboundConnectionPerSource 50
    In this case, the MaxInboundConnectionPerSource will be set to 50.

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