DOCUMENT:Q139978  13-JUN-2001  [sna]
TITLE   :TN3270 Server Can Incorrectly Terminate a Session
PRODUCT :Microsoft SNA Server
PROD/VER:WINDOWS:2.11
OPER/SYS:
KEYWORDS:

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-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft SNA Server, version 2.11 
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SYMPTOMS
========

There are two possible symptoms:

 - The TN3270 Server logs an error 309 and terminates the session.

   -or-

 - The TN3270 Server encounters an application exception.

CAUSE
=====

Occasionally, the TN3270 Server can process an RUI_READ completion before the
verb has actually completed.

The RUI event completion code in the TN3270 Server leaves open timing windows
where either of these two events might happen:

 - If an RUI_READ and RUI_WRITE are outstanding and the RUI_READ completes, the
   TN3270 Server might act as if the RUI_WRITE has completed.

   -or-

 - If an RUI_READ and RUI_WRITE are outstanding and the RUI_WRITE completes, the
   TN3270 Server might act as if the RUI_READ has completed.

In either case, the TN3270 Server can examine the RUI verb control block at the
same time the RUI library is filling in the verb control block.


RESOLUTION
==========

Microsoft has updated the file to correct this problem.

   EXE\WIN32\TN3SERVR.EXE


STATUS
======

Microsoft has confirmed this to be a problem in SNA Server for Windows NT. This
problem was corrected in the latest SNA Server for Windows NT, 2.11 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: prodsna

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Keywords          :  
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ211
Version           : WINDOWS:2.11

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

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