DOCUMENT:Q143478    [winnt]
TITLE   :Stop 0A in TCPIP.SYS When Receiving Out Of Band (OOB) Data
PRODUCT :Microsoft Windows NT
PROD/VER:3.51 4.00
OPER/SYS:WINDOWS
KEYWORDS:kbbug3.51 kbbug4.00 kbfile kbfix3.51 kbfix4.00 NTSrvWkst nttcp

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

 - Microsoft Windows NT Workstation versions 3.51 and 4.0
 - Microsoft Windows NT Server versions 3.51 and 4.0
--------------------------------------------------------------------------

SYMPTOMS
========

A Stop 0x0000000A occurs in Tcpip.sys when receiving Out of Band (OOB)
data.

CAUSE
=====

A sender specifies "Out of Band" data by setting the URGENT bit flag in the
TCP header. The receiver uses the URGENT POINTER to determine where in the
segment the urgent data ends. Windows NT bugchecks when the URGENT POINTER
points to the end of the frame and no normal data follows. Windows NT
expects normal data to follow.

RESOLUTION
==========

Microsoft has updated Tcpip.sys to correct the problem. Instructions for
installing it are available from Microsoft support channels, or directly
from the following Internet locations:

** NOTE: This hotfix was originally posted on 5/12/97. A second fix **
** was completed on 5/21/97, to address another nearly identical    **
** attack, and this hotfix has replaced the original one.           **
** The first hotfix is included in 4.0 SP3, however the second one  **
** is not, so a 4.0 post-sp3 is now available also.                 **


Windows NT 4.0 SP2
------------------

This hotfix has been posted to the following Internet location:

   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/
   hotfixes-postSP2/oob-fix

NOTE: Service pack 2 must be applied to Windows NT 4.0 prior to applying
this fix.

Windows NT 4.0 SP3
------------------

This hotfix has been posted to the following Internet location:

   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/
   hotfixes-postSP3/oob-fix

NOTE: Service pack 3 must be applied to Windows NT 4.0 prior to applying
this fix.

Windows NT 3.51
---------------

This hotfix has been posted to the following Internet location:

   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT351/
   hotfixes-postSP5/oob-fix

NOTE: Service pack 5 must be applied to Windows NT 3.51 prior to applying
this fix.

STATUS
======

Microsoft has confirmed this to be a problem in Windows NT version 3.51 and 
4.0. A supported fix is now available, but has not been fully regression-tested
and should be applied only to systems experiencing this specific problem.
Unless you are severely impacted by this specific problem, Microsoft
recommends that you wait for the next Service Pack that contains this fix.
Contact Microsoft Technical Support for more information.

Additional query words: prodnt 4.00 3.51 

============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.  MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.  SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1997.