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Q259148: Random "Access Violation" Error Messages in EnumProtocolsW()

Article: Q259148
Product(s): Microsoft Windows NT
Version(s): 2000,4.0
Operating System(s): 
Keyword(s): kbWin2000PreSP1Fix kbWinNT400PreSP7Fix kbWin2000sp1Fix
Last Modified: 08-MAY-2002

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Windows NT Server version 4.0 
- Microsoft Windows NT Server, Enterprise Edition version 4.0 
- Microsoft Windows 2000 Advanced Server 
- Microsoft Windows 2000 Server 
- Microsoft Windows 2000 Professional 
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SYMPTOMS
========

Under stress, Microsoft Exchange or other programs may stop working and may
generate Dr. Watson error messages ("Access violation").

If symbols are installed, the stack traces in the Dr. Watson log show that the
problem occurs near the EnumProtocolsW function. The stack traces may vary in
different situations. Two sample stack traces are listed here:

  *----> Stack Back Trace <----*
  ReturnAd Param#1  Param#2  Param#3  Param#4  Function Name
  77673a3a 00c70000 00000000 00000208 3ff2f2c0 ntdll!RtlAllocateHeap 
  77673d4b 00000000 3ff2f2e0 3ff2f2bc 3ff2f2c0 mswsock!EnumProtocolsW 
  00495a93 00000000 3ff2f2c0 3ff2f2bc 00000010 mswsock!EnumProtocolsA 
  00000000 00000000 00000000 00000000 00000000 store!<nosymbols> 

  *----> Stack Back Trace <----*
  ReturnAd Param#1  Param#2  Param#3  Param#4  Function Name
  77f64e17 00c70000 00c730f8 04a2f21c 00000000 ntdll!RtlDestroyHeap 
  77673b22 00c70000 00000000 00c73100 04a2f2c0 ntdll!RtlFreeHeap 
  77673d4b 00000000 04a2f2e0 04a2f2bc 04a2f2c0 mswsock!EnumProtocolsW 
  00495a93 00000000 04a2f2c0 04a2f2bc 00000010 mswsock!EnumProtocolsA 
  00000000 00000000 00000000 00000000 00000000 store!<nosymbols> 

CAUSE
=====

The EnumProtocols function in Windows Sockets (Mswsock.dll) is calculating a
buffer length incorrectly, resulting in heap corruption.


RESOLUTION
==========

Windows 2000
------------

To resolve this problem for Windows 2000, obtain the latest service pack for
Windows 2000. For additional information, please see the following article in
the Microsoft Knowledge Base:

  Q260910 How to Obtain the Latest Windows 2000 Service Pack


Windows NT 4.0
--------------

A supported fix is now available from Microsoft, but it is only intended to
correct the problem that is described in this article. Apply it only to
computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the
fix. For a complete list of Microsoft Product Support Services phone numbers and
information about support costs, visit the following Microsoft Web site:

  http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls
may be canceled if a Microsoft Support Professional determines that a specific
update will resolve your problem. The usual support costs will apply to
additional support questions and issues that do not qualify for the specific
update in question.

The English version of this fix should have the following file attributes or
later:

  Date      Time   Size     File name    Platform
  -----------------------------------------------
  21/03/00  21:48   76,560  Mswsock.dll  Intel
  21/03/00  21:48   20,752  Wsock32.dll  Intel
  21/03/00  21:46  120,592  Mswsock.dll  Alpha
  21/03/00  21:46   25,360  Wsock32.dll  Alpha



STATUS
======

Microsoft has confirmed that this is a problem in the Microsoft products that
are listed at the beginning of this article.

This problem was first corrected in Windows 2000 Service Pack 1.

Additional query words:

======================================================================
Keywords          : kbWin2000PreSP1Fix kbWinNT400PreSP7Fix kbWin2000sp1Fix 
Technology        : kbWinNTsearch kbWinNT400search kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000Serv kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400search kbWinNTS400 kbwin2000ServSearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbWinAdvServSearch
Version           : :2000,4.0
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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