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Event ID: 3120 Source: MSExchangeMTA

Source
Level
Description
A resource limit has been reached when attempting to open an association. Number of sessions configured: 30
Comments
 
As per Microsoft: "When an installation has several gateways and connectors configured, additional resources may be required". See MSEX2K3DB for additional information about this event.
The MTA terminated due to a resource shortage. See ME155302 to find out how you can avoid this resource shortage.

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