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Q247332: IBM PCOM 5250 Fails after a 3270/FMI Session Is Closed

Article: Q247332
Product(s): Microsoft SNA Server
Version(s): WINDOWS:3.0 (all SP),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 3.0 SP1, 3.0 SP2, 3.0 SP3, 3.0 SP4, 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3 
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SYMPTOMS
========

When you use IBM Personal Communications (version 4.3) with the SNA 4.0 Windows
95/98 client software or with the SNA 4.0 Windows NT client software, a 5250
session stops responding or fails with a page fault after a 3270 session is
closed. For example:

  PCSCM caused an invalid page fault in module WAPPC32.DLL at 015f:6340e645

The offset may vary depending on the version of the SNA Windows 95/98 or Windows
NT client software being used.

CAUSE
=====

If an application supports both a 3270/FMI session and an APPC or CPIC
conversation from the same process, and closes the 3270/FMI session by calling
the sbputerm() function, the SNA client incorrectly frees the SNADMOD client
code while the APPC/CPIC application is still active.

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



WORKAROUND
==========

To work around this problem, do not close the 3270 session if an APPC
conversation is still active, or close the APPC conversation before the 3270
session is closed.

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft SNA Server version
3.0, 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:

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Keywords          : kbSNA400sp4fix kbSNA400PreSP4fix 
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ400 kbSNAServ300SP3 kbSNAServ300SP1 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3 kbSNAServ300SP2 kbSNAServ300SP4
Version           : WINDOWS:3.0 (all SP),4.0,4.0 SP1,4.0 SP2,4.0 SP3
Issue type        : kbbug
Solution Type     : kbfix

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