Microsoft KB Archive/243759

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XCON: Message Transfer Agent May Stop on 9405 Errors with Access Violation

Article ID: 243759

Article Last Modified on 10/26/2006


  • Microsoft Exchange Server 5.5 Standard Edition

This article was previously published under Q243759


The Microsoft Exchange Server message transfer agent (MTA) may repeatedly stop with the following event in the Windows NT Event Viewer:

Event 9405:

An unexpected error has occurred which may cause the MTA to terminate. Error: Access violation (0xc0000005) at Address 0x5e215a reading from 0x0. [BASE XFER-OUT 20] (16)


The MTA is not properly deleting an entity control block after routing a message.


To resolve this problem, obtain the latest service pack for Exchange Server 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

191014 XGEN: How to Obtain the latest Exchange Server 5.5 Service Pack


Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 4.

Keywords: kbbug kbexchange550presp4fix kbexchange550sp4fix kbfix kbqfe KB243759