DOCUMENT:Q234932  08-MAY-2002  [sna]
TITLE   :TN3270 Access Violation When Using Unique Ports for Sessions
PRODUCT :Microsoft SNA Server
PROD/VER:WINDOWS:3.0,3.0SP1,3.0SP2,3.0SP3,3.0SP4,4.0,4.0SP1,4.0SP2
OPER/SYS:
KEYWORDS:kbsna400sp3fix kbsna300sp1 kbsna300sp2 kbsna300sp3 kbsna300sp4 sna4 kbsna400sp1 kbsna40

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The information in this article applies to:

 - Microsoft SNA Server, versions 3.0, 3.0SP1, 3.0SP2, 3.0SP3, 3.0SP4, 4.0, 4.0SP1, 4.0SP2 
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SYMPTOMS
========

Attempting to start the TN3270 server may result in an access violation if it
has more than fifty TN3270 sessions configured to use unique TCP/IP ports.

If the Windows NT Server running SNA Server is configured with Drwtsn32.exe as
the default debugger, a Drwtsn32.log will be generated when the access violation
occurs.

The Drwtsn32.log may contains entries similar to one of the following if this
problem occurs:

   

   Application exception occurred:
        App: exe\tn3servr.dbg (pid=<process ID>)
        When: <date> @ <time>
        Exception number: c0000008

   [data omitted]

   function: RtlRaiseStatus
   [...]
   FAULT ->77f88f29 8be5             mov     esp,ebp
   [...]

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

   FramePtr ReturnAd Param#1  Param#2  Param#3  Param#4  Function Name
   00efff28 77f6cf15 c0000008 00000000 77f675ad 00098e64 ntdll!RtlRaiseStatus 
   602012a0 55536021 57c08556 0102840f 15ff0000 60201050 ntdll!RtlpUnWaitCriticalSection 

   Application exception occurred:
        App: exe\tn3servr.dbg (pid=<process ID>)
        When: <date> @ <time>
        Exception number: c0000005 (access violation)

   [data omitted]

   function: RtlpWaitForCriticalSection
   [...]
   FAULT ->77f6cc66 ff4010           inc     dword ptr [eax+0x10]   
   [...]

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

   FramePtr ReturnAd Param#1  Param#2  Param#3  Param#4  Function Name
   00d8fc18 77f67456 00095d54 01017c7e 00095d54 00084ed8 ntdll!RtlpWaitForCriticalSection 
   00d8ffb8 77f04f2c 00000000 00000002 0000012e 00000000 ntdll!RtlEnterCriticalSection 
   00d8ffec 00000000 00000000 00000000 00000000 00000000 kernel32!lstrcmpiW 
   00000000 00000000 00000000 00000000 00000000 00000000 tn3servr!<nosymbols>

In addition, the following events may be logged in the Windows NT Application
Event Log:

   Event ID: 902
   Source: TN3270 Server
   Description: Logic error in module SocketActivateEvent identified by:
   CouldNotFindSocket

   Event ID: 902
   Source: TN3270 Server
   Description: Logic error in module SocketAdd identified by: NoFreeSockets

CAUSE
=====

The TN3270 server is not correctly handling the initialization of more than 50
unique TCP/IP ports. This results in the access violations discussed above when
starting a TN3270 server configured with Logical Units (LUs) using unique TCP/IP
ports.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for SNA Server version
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 Server versions
3.0, 3.0 SP1, 3.0 SP2, 3.0 SP3, 3.0 SP4, 4.0, 4.0 SP1, 4.0 SP2. This problem was
first corrected in SNA Server version 4.0 Service Pack 3.

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

In addition to correcting the access violations when initializing more than 50
unique TCP/IP ports, the TN3270 server has been updated to listen over a maximum
of 1,000 unique TCP/IP ports. Previously, the TN3270 server could listen over a
maximum of 64 unique TCP/IP ports.

With this update applied, the TN3270 can be configured to listen over port 23
(the default TN3270 port) plus an additional 999 user-defined ports.

Please refer to the on-line SNA Server Help for more details on how to configure
the TN3270 server and its TN3270 LUs to use specific ports other than the
default port of 23.

Additional query words:

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Keywords          : kbsna400sp3fix kbsna300sp1 kbsna300sp2 kbsna300sp3 kbsna300sp4 sna4 kbsna400sp1 kbsna400sp2 
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ300 kbSNAServ400
Version           : WINDOWS:3.0,3.0SP1,3.0SP2,3.0SP3,3.0SP4,4.0,4.0SP1,4.0SP2
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

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