Microsoft KB Archive/169143

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XCON: MTA Event 9221 A sockets error 10054 on a WSARecvEx() Call was Detected

Article ID: 169143

Article Last Modified on 10/28/2006


  • Microsoft Exchange Server 5.5 Standard Edition
  • Microsoft Exchange Server 4.0 Standard Edition
  • Microsoft Exchange Server 5.0 Standard Edition

This article was previously published under Q169143


You may encounter a MSExchangeMTA Event 9221 in the Windows NT Application Log that contains a sockets error 10054 similar to the following example:

   Event ID: 9221
   Source:   MSExchangeMTA
   Type:     Warning
   Category: Operating System

A sockets error 10054 on a WSARecvEx() call was detected. The message transfer agent (MTA) will attempt to recover the sockets connection. Control block index: 1. [BASE IL TCP/IP DRVR 10 262] (12)


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.

Winsock Error code 10054 (WSAECONNRESET) indicates a "Connection reset by peer."

Keywords: kbprb KB169143