KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q153253: SNA Server 3270 Sessions Not Recovered with Eicon WAN Server

Article: Q153253
Product(s): Microsoft SNA Server
Version(s): WINDOWS:2.0,2.1,2.11,2.11 SP1
Operating System(s): 
Keyword(s): kb3rdparty
Last Modified: 13-JUN-2001

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

- Microsoft SNA Server, versions 2.0, 2.1, 2.11, 2.11 SP1, on platform(s):
   - the operating system: Microsoft Windows NT 
-------------------------------------------------------------------------------


SYMPTOMS
========

When you simulate a link failure using an EICON SDLC card with the following
test, the sessions go into an unrecoverable state:

1. Configure the Eicon card to detect a link failure after 30 seconds.

2. Set up the LU sessions over the Eicon Link to the host (LU-LU sessions).

3. Disconnect the cable and then reconnect in 5 to 10 seconds.

At this point, the sessions that were active do not recover. However, the LUs
that were not in session are able to connect.

If you wait more than 30 seconds to reconnect the cable, the EICON card will
detect the link failure, and SNA Server will recover properly.


CAUSE
=====

SNA Server fails to inform the emulator correctly of the PU reactivation and the
emulator does not know that its PLU-SLU session has disappeared. This fix makes
the SNA Server treat ACTPU(ERP) requests from the host as if they were
ACTPU(COLD) and resets all the underlying LU-SSCP and PLU-SLU sessions.

If you want to continue with the existing implementation, a new registry entry
has been added. It is called ACTPUERP, under
\\HKLM\System\CurrentControlSet\Services\SnaServr\Parameters. It is a REG_SZ
value, and when it is set to any value, it will re-enable ERP support. If it is
not present, all ACTPUs will be treated as COLD.

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft SNA Server 2.0, 2.1,
2.11, and 2.11.sp1.
This problem was corrected in the latest Microsoft SNA Server 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

======================================================================
Keywords          : kb3rdparty 
Technology        : kbAudDeveloper kbSNAServSearch
Version           : WINDOWS:2.0,2.1,2.11,2.11 SP1
Issue type        : kbbug
Solution Type     : kbfix

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

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.