DOCUMENT:Q139674  13-JUN-2001  [sna]
TITLE   :Enhanced Error Description for Message 631
PRODUCT :Microsoft SNA Server
PROD/VER:WINDOWS:2.0,2.1,2.11
OPER/SYS:
KEYWORDS:

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The information in this article applies to:

 - Microsoft SNA Server, versions 2.0, 2.1, 2.11, on platform(s):
    - the operating system: Microsoft Windows NT 
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SYMPTOMS
========

SNA Server may log the following error if an internal client-server
communication error is detected:

   Message 631
   Invalid message received across the LAN

   EXPLANATION: This is an internal error.

   ACTION: Contact support services at your site.

This message, however, does not indicate the underlying cause of the error.

CAUSE
=====

Message 631 is logged by SNA Server if any of the following error conditions is
detected in a message sent by another SNA Server component:

 - The mhtype is invalid.

 - The message ID is invalid.

 - The sequence number is wrong.

The mhtype, message ID, and sequence number are included in all messages passed
between SNA Server components (for example, between SNA Server and a 3270 or
APPC application, between SNA Server and a link service, and between SnaBase and
an SNA client).

RESOLUTION
==========

Microsoft has updated the following files to correct this problem:

   SNAEVENT.DLL
   SNALM.DLL
   SNAIP.DLL
   SNANW.DLL
   SNANB.DLL
   SNABV.DLL
   SNAAT.DLL

With this fix applied, Message 631 now logs the following information:

 - The reason for logging the event.

 - Message header information.

 - Expected sequence number.

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 2.00 2.10 2.11

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Keywords          :  
Technology        : kbAudDeveloper kbSNAServSearch
Version           : WINDOWS:2.0,2.1,2.11
Issue type        : kbbug
Solution Type     : kbfix

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Copyright Microsoft Corporation 2001.