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Event ID: 9221 Source: MSExchangeMTA

Source
Level
Description
A sockets error {error code} on a WSARecvEx() call was detected. The MTA will attempt to recover the sockets connection. Control block index: <index name>. [<value><value><value><value>] (12).
Comments
 
As per Microsoft: "This problem may occur when there is insufficient bandwidth or many network errors.It may be due to heap corruption when two or more threads in the message transfer agent (MTA) try to access the same data structures without proper synchronization". See MSEX2KDB for additional information on this event.
As per Microsoft: "A 10054 socket error in this context is not an indication of a problem, but is currently known and expected behavior. It happens any time a WinSock connection is closed down (TCP/IP or TP4, whether clean or dirty). Although this event by itself may be confusing, it is not harmful". See ME169143, ME162674 and the link to Error code 10054 for more details.

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