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Q164575: Application Exception in SNA Server Using APPC Sync Level 2

Article: Q164575
Product(s): Microsoft SNA Server
Version(s): WINDOWS:3.0
Operating System(s): 
Keyword(s): 
Last Modified: 13-JUN-2001

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The information in this article applies to:

- Microsoft SNA Server, version 3.0 
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SYMPTOMS
========

When an APPC application uses sync point level 2 support (the SYNCPT API, new in
SNA Server 3.0) and the LU 6.2 conversation is deactivated, the SNA Server
service on an SNA Server 3.0 system may experience an application exception.
This exception causes a Dr. Watson log to be generated. The Drwtsn32.log file
may contain information similar to the following when this occurs:

  Application exception occurred:
  Application: exe\snaservr.DBG (pid=<process number>)
  When: <date> @ <time>
  Exception number: c0000005 (access violation)

When the application exception occurs, an Event 624 is also logged to the Windows
NT Application Event log:

  Event ID: 624
  Source: SNA Server
  Description: Creating dump file SNADUMP.LOG for SNASERVR.EXE

CAUSE
=====

The application exception occurs because the SNA Server service adds IBM Sense
Codes to an UNBIND RU before the length of the data message is correctly
specified. This only occurs when an APPC application is using the sync point
level 2 API support and the LU 6.2 conversations are deallocated abnormally.


RESOLUTION
==========

The SNA Server service has been updated to correct this problem. The updated
modules are:

  <snaroot>\system\snaservr.exe
  <snaroot>\system\trcservr.exe (used for debug purposes only)

STATUS
======

Microsoft has confirmed this to be a problem in SNA Server version 3.0. This
problem was corrected in the latest Microsoft SNA Server 3.0 U.S. Service Pack.
For information on obtaining the service pack, query on the following word in
the Microsoft Knowledge Base (without the spaces):

  S E R V P A C K

Additional query words: syncpt backout sna30

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Keywords          :  
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ300
Version           : WINDOWS:3.0
Issue type        : kbbug
Solution Type     : kbfix

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