Microsoft KB Archive/246608

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XCON: Event ID 9405: MTA Causes Access Violation

Article ID: 246608

Article Last Modified on 10/28/2006


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

This article was previously published under Q246608


The Exchange Server message transfer agent (MTA) may generate a Dr. Watson event with the following error message:

An application error has occurred and an application error log is being generated.
Exception: access violation (0xc0000005), Address: 0x0041cb74

At the same time, the MTA generates a 9405 event in the application event log as follows:

Event ID: 9405 Source: MSExchangeMTA
Type: Error Category: Field Engineering
Description: An unexpected error has occurred which may cause the MTA to terminate. Error: Access violation (0xc0000005) at Address 0x41cb74 reading from 0x4. [BASE TRANSFER 16] (16)

Further examination of the User.dmp file reveals the following call stack:

FramePtr  RetAddr   Param1   Param2   Param3   Function Name
0471fea4  00426fb3  00000000 00920006 00000000 EMSMTA!<B>MtaQueueAdd</B>+0x51({...})
0471fee0  00426cea  00435c0f 00000001 01dc7210 EMSMTA!oxpusecu+0x1e3
0471ff10  00426c2d  00435c0f 0471ff44 00426b37 EMSMTA!oxptrxfr+0xa1
0471ff1c  00426b37  00435c0f 00435c0f 01e54494 EMSMTA!oxptrrcv+0x2d
0471ff44  00416536  00435c0f 017dff68 01e9ac68 EMSMTA!oxptrcv+0x13b
0471ff5c  004569fd  01eb4be8 01be0014 00000258 EMSMTA!UtilSendXapiQueue+0x56
0471ff8c  00435c86  01be0014 1004f868 0000000f EMSMTA!otpomain+0x15b
0471ffb8  77f04f3e  0000000f 01be0014 1004f868 0x00435c86
0471ffec  00000000  00000000 00000000 00000000 KERNEL32!BaseThreadStart+0x51

At this point, the MTA will not start until the problem is resolved.


The access violation occurs when the MTA is trying to build an X.400 application programming interface (XAPI) transfer queue to an Exchange Server computer that no longer exists within the site.


The problem may be prevented by removing all references to the problem XAPI connector (that is, Internet Mail Service, cc:Mail, Notes, GroupWise, SNADS, OV/VM, Fax, Pager, and so on). Specifically, use the Delete Raw Object option to remove the problem XAPI connector from the Connections container, and then recalculate routing.

WARNING: If you use the raw mode of the Exchange Server Administrator program (admin /r) incorrectly, serious problems may occur that may require you to reinstall Microsoft Windows NT Server, Microsoft Exchange Server, or both. Microsoft cannot guarantee that problems that result from using raw mode incorrectly can be solved. Use raw mode at your own risk.

  1. Start the Microsoft Exchange Server Administrator program in raw mode by typing the following at a command prompt:

    c:\exchsrvr\bin\admin /r

  2. Click the problem XAPI connector in the Connections container, and then on the Edit menu, click Delete RAW Object.
  3. You receive the following message:

    The selected object and all objects below it will be deleted from the directory service. Deletions will take effect immediately and will replicate to other servers. Are you sure you want to proceed?

  4. Click OK, and then click YES.
  5. You may also see the following warning:

    Extension 'SMTP' could not be loaded.

    If you do, click Ignore. The connector should now be removed.

You must now recalculate the routing table:

  1. In the Exchange Server Administrator program, click to expand the Site object, click Configuration, and double-click the Site Addressing object to open its properties.
  2. Click the Routing tab, and then click the Recalculate Routing button. A message appears that states:

    It will take several minutes for the new routing information to be replicated across your site and then take effect.

  3. Check each server's routing table in the site, and make sure that this route gets removed.
  4. After the route is removed from the entire site, you may restart the MTA on the Exchange Server computer that had the access violation.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. If the procedure described above does not resolve this problem, contact Microsoft Product Support Services for assistance with detailed troubleshooting of the problem.

Additional query words: crash drwtsn32.log user.dmp evt hang

Keywords: kbbug kbnofix KB246608