DOCUMENT:Q137902  13-JUN-2001  [sna]
TITLE   :SNASERVR.EXE Traps When it Receives an Illegal SIGNAL Command
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
========

The SNA Server generates a Dr. Watson error when it receives an illegal SIGNAL
command from a host system. The DRWTSN32.LOG file indicates that an Application
Exception has occurred in SNASERVR.EXE. In addition, SNA Server logs Event 624
in the Windows NT application log when the SNASERVR.EXE trap occurs. The Event
624 has a description similar to the following:

   Creating dump file C:\SNA\traces\snadump.log for SNASERVR.EXE

   EXPLANATION
   A process (SNASERVR.EXE) ended abnormally due to a protection violation or
   similar condition and a dump file SNADUMP.LOG has been created that contains
   information about the state of the process at the time of the exception.
   Register information is contained in your Windows NT root directory in the
   file DRWTSN32.LOG.

CAUSE
=====

The SIGNAL command consists of the command byte and a four-byte value, according
to the IBM SNA Formats Guide. Therefore, any SIGNAL command that consists of
fewer than five bytes is illegal. The SNA Server Node (SNASERVR.EXE) will trap
as described above if it receives an illegal SIGNAL command containing fewer
than 5 bytes. In addition, a similar trap on the receipt of an illegal LUSTAT
command containing too few bytes is also possible.

NOTE: Please refer to the RU section of the IBM SNA Formats Guide (GA27-3136) for
more specifics on format of SNA commands.


RESOLUTION
==========

Microsoft has updated the file SNASERVR.EXE to correct this problem.


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

KBCategory: kbnetwork kbbug2.00 kbbug2.10 kbbug2.11
KBSubcategory: ntnetserv

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

This problem was encountered by a customer when sending an illegal SIGNAL
command data message to SNA Server from a host simulator. This problem has not
been encountered when running SNA Server against actual SNA connectivity
products from IBM or any other vendor.

Additional query words: node sig 3270 mainframe vtam prodsna event viewer

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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.