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Event ID: 1456 Source: MSExchangeMTA

Source
Level
Description
Association Recovery Failed - Original RTSE Control Block 2009 in wrong state 25. [PLATFORM RTSE 26 156] (14)
Comments
 
As per Microsoft: "This error message occurs when Exchange first encounters a problem with moving a message across a network". See MSEX2KDB for additional information about this event.
This event may be related to network connectivity. In our case, the port setting between the router and the switch on which the servers sat needed to be reset. MTA servers in another segment reported Event ID 9316 during this time. Correcting the port issue corrected both errors.

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