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Q243917: SNA Workstation 4.0 Access Violation When SnaBase Ends

Article: Q243917
Product(s): Microsoft SNA Server
Version(s): WINDOWS:4.0,4.0 SP1,4.0 SP2,4.0 SP3
Operating System(s): 
Keyword(s): _IK kbSNA400sp4fix kbSNA400PreSP4fix
Last Modified: 08-DEC-2000

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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
========

When using SNA Workstation 4.0 or 4.0 Service Pack 1, the following problems may
occur:

- a 3270 emulator may stop responding while opening a new 3270 session

- SnaBase.exe may fail with an access violation (C0000005) when being stopped,
  with the following stack trace:

  FramePtr  RetAddr   Param1   Param2   Param3   Function Name
  13f6fca8  77f64ba2  00080000 000f2440 13f6fcd4 NTDLL!RtlpCoalesceFreeBlocks+0x2bc
  13f6fcd8  0101dbf9  00080000 00000000 000f2448 NTDLL!RtlFreeHeap+0x7c
  13f6fce8  0101b760  00000000 6723e4a8 00000001 SNABASE!CleanupCaching+0x19
  13f6fcf0  6723e4a8  00000001 00000000 6727a5e0 SNABASE!NapTermCallback+0xa0
  13f6fd10  67239925  00000000 00000000 00000000 SNADMOD!TermSnaDmod_int+0x68
  6727a5e0  00000002  000000f4 000000f8 000000f0 SNADMOD!DMODServiceThread+0xa55

CAUSE
=====

This problem is caused by a regression introduced into SNA Workstation 4.0
Service Pack 1 due to an unrelated change made within SNA Server, which shares
various components. The problem does not affect any version of SNA Server. It is
specific to SNA Workstation only.

RESOLUTION
==========

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

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



STATUS
======

Microsoft has confirmed this to be a problem in Microsoft SNA Workstation
version 4.0 and version 4.0 Service Pack 1.

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

Additional query words:

======================================================================
Keywords          : _IK 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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