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Q257759: TN5250 Service Ends Unexpectedly When Client Disconnects

Article: Q257759
Product(s): Microsoft SNA Server
Version(s): WINDOWS:4.0,4.0 SP1,4.0 SP2,4.0 SP3
Operating System(s): 
Keyword(s): kbSNA400sp4fix kbSNA400PreSP4fix
Last Modified: 13-JUN-2001

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The information in this article applies to:

- Microsoft SNA Server, versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3 
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SYMPTOMS
========

The TN5250 Service may end unexpectedly when a TN5250 client disconnects. This
problem occurs when you use the WRQ Reflections TN5250 client, although it can
also occur with other client emulators.

When the failure occurs, a Ddrwtsn32.log file indicates that a hard-coded
breakpoint occurred. For example:

  Application exception occurred:
  App: obj\i386\tn5250.exe (pid)
  When: (date) (time)
  Exception number: 80000003 (hardcoded breakpoint)

  [...]

  State Dump for Thread Id 0x1b9

  eax=00000000 ebx=0110fc74 ecx=00000085 edx=0110fbe8 esi=78022b9a edi=0110fbea
  eip=77f762e8 esp=0110fb14 ebp=0023c951 iopl=0 nv up ei pl nz ac po nc
  cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000216

  [...]
  function: DbgBreakPoint
  FAULT ->77f762e8 cc int 3
  77f762e9 c3 ret
  77f762ea 8bc0 mov eax,eax

  *--- Stack Back Trace ----*

  FramePtr ReturnAd Param#1 Param#2 Param#3 Param#4 Function Name
  0023c951 00000000 00000000 00000000 00000000 00000000 ntdll!DbgBreakPoint
  00000000 00000000 00000000 00000000 00000000 00000000 tn5250!nosymbols

CAUSE
=====

A timing window can occur during client shutdown processing when an outstanding
TEST_RTS_AND_POST verb is cancelled and TP_ENDED is called twice in error. When
the second TP_ENDED returns an error, the TN5250 Service may force a hard-coded
breakpoint, causing the process to end.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for SNA Server 4.0. For
additional information, click the following article number to view the article
in the Microsoft Knowledge Base:

  Q215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack



STATUS
======

Microsoft has confirmed that this is a problem in Microsoft SNA Server version
4.0, 4.0 SP1, 4.0 SP2 and 4.0 SP3.

This problem was first corrected in SNA Server 4.0 Service Pack 4.

Additional query words:

======================================================================
Keywords          : kbSNA400sp4fix kbSNA400PreSP4fix 
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ400 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3
Version           : WINDOWS:4.0,4.0 SP1,4.0 SP2,4.0 SP3
Issue type        : kbbug
Solution Type     : kbfix

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