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Q170660: TN3270 Server Access Violation in SetBestGroups()

Article: Q170660
Product(s): Microsoft SNA Server
Version(s): WINDOWS:3.0 SP1
Operating System(s): 
Keyword(s): kbnetwork
Last Modified: 13-JUN-2001

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The information in this article applies to:

- Microsoft SNA Server, version 3.0 SP1 
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SYMPTOMS
========

When a TN3270E print emulator attempts to open a printer session through the SNA
Server 3.0 Service Pack 1 TN3270 Server, the TN3270 server may encounter the
following access violation:

  

  Application exception occurred:
     App: tn3servr.DBG (pid=<process id>)
     Exception number: c0000005 (access violation)

  [data omitted]

  function: SetBestGroups

  FAULT ->01012c07 8b4804     mov  ecx,[eax+0x4]   ds:0068e922=????????

CAUSE
=====

This is caused by a problem in the SNA Server 3.0 Service Pack 1 TN3270 server,
which was introduced by the addition of support for multiple ports.

STATUS
======

Microsoft has confirmed this to be a problem in SNA Server version 3.0 Service
Pack 1. This problem was corrected in the latest SNA Server version 3.0 U.S.
Service Pack. For information on obtaining this Service Pack, query on the
following word in the Microsoft Knowledge Base (without the spaces):

  S E R V P A C K


MORE INFORMATION
================

When this problem occurs, the stack back trace looks like the following:

  *----> Stack Back Trace <----*

  FramePtr ReturnAd Param#1  Param#2  Param#3  Param#4  Function Name
  0ca5fc10 01013e60 00183230 0ca5fc34 001849a2 001833c8
     tn3servr!SetBestGroups
  0ca5fc98 0100faa8 00183230 001849a2 0ca5fcbc 001849a2
     tn3servr!SRSGetSNAResourceFirst
  0ca5fd54 010184e3 00183230 001849a2 00183888 00000010
     tn3servr!SNAGenericSessionStart
  0ca5fd70 010179b7 00183230 00183230 0101704b 00183230
     tn3servr!TNTContinueDataFromNetwork
  0ca5fd7c 0101704b 00183230 0ca5ff5c 0ca5fe3c 00183230
     tn3servr!TNTContinueDataFromNetwork
  0ca5fd94 01018580 00183230 010152b2 00183230 00000011
     tn3servr!TNTContinueDataFromNetwork
  0ca5fd9c 010152b2 00183230 00000011 0ca5fe3c 001837cc
     tn3servr!TNTDataFromNetwork
  0ca5fe14 77f4f7c2 00000000 00000011 001837cc 7ffdf000 tn3servr!TCPRecv
  0ca5fe28 77fb03bb 01015100 001837cc 00000000 00010017
     kernel32!<nosymbols>
  0ca5ff5c 0100c876 00000003 0018d0b8 00000000 006ddcce ntdll!<nosymbols>

Additional query words:

======================================================================
Keywords          : kbnetwork 
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ300SP1
Version           : WINDOWS:3.0 SP1
Issue type        : kbbug
Solution Type     : kbfix

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