Article: Q160576
Product(s): Microsoft SNA Server
Version(s): WINDOWS:2.0,2.1,2.11,3.0,4.0
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, versions 2.0, 2.1, 2.11, 3.0, 4.0, on platform(s):
- the operating system: Microsoft Windows NT
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SYMPTOMS
========
SNA Server clients using 3270 display sessions are returned to the SSCP (VTAM
Signon) screen unexpectedly while actively working in a host application. The
SNA Server may log one or more of the following events in the Windows NT
Application Event Log when this problem occurs:
Event ID: 4
Source: SNA Server
Description: (1133) Message Sequence Error
EXPLANATION
The SNA server (node) received an invalid or unexpected message from a
remote node on an SNA session. The remote system has a possible
configuration or internal logic error.
SUBCODE INFORMATION
X'1133' The node received a request with an invalid sequence number.
Event ID: 12
Source: SNA Server
Description: (1118) Negative Response from Remote System (SENSE = 200D)
SUBCODE INFORMATION
X'1118' The local SNA server (node) received an SNA negative response
on an SNA session from a remote system, which indicates a protocol
violation by the 3270 emulator. The SNA sense code shown gives details
of the type of error. See "IBM Systems Network Architecture: Formats"
for an explanation of the sense code.
Event ID: 13
Source: SNA Server
Description: (1141) Message Sequence Error (SENSE = 2001)
EXPLANATION
The SNA server (node) received an invalid or unexpected message from a
remote node during an SNA session. The cause is probably a logic error
in the remote system. The SNA sense data shown gives details of the type
of error.
SUBCODE INFORMATION
X'1141' Session-level protocol violation in an SNA message from the
partner
LU.
CAUSE
=====
This has only been reported on SNA Servers with 802.2 connections to IBM 3174
Control Units on Ethernet networks. The problem occurs because a 3174 Ethernet
gateway may send a duplicate SNA sequence number to the SNA Server when the 3174
is handling an SNA frame between 1490 and 1493 bytes in size. This leads to a
condition where a frame may be re-sent by the 3174 causing the symptoms
discussed previously. In addition, the problem only occurs if the 3174 is
running 3174 Microcode Level C6.1 or C6.2.
RESOLUTION
==========
A fix for this problem is available from IBM. Contact IBM support and request
IBM 3174 PTR #B27E.
MORE INFORMATION
================
For information about how to contact IBM, query in the Knowledge Base for one of
the following articles:
Q65416 Hardware and Software Third-Party Vendor Contact List, A-K
Q60781 Hardware and Software Third-Party Vendor Contact List, L-P
Q60782 Hardware and Software Third-Party Vendor Contact List, Q-Z
The third-party products discussed here are manufactured by vendors independent
of Microsoft; we make no warranty, implied or otherwise, regarding these
products' performance or reliability.
Additional query words: prodsna
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Keywords : kbnetwork
Technology : kbAudDeveloper kbSNAServSearch
Version : WINDOWS:2.0,2.1,2.11,3.0,4.0
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