SNA Server May Fail to Reestablish a Session Under Certain Conditions (235959)


The information in this article applies to:

  • Microsoft SNA Server 4.0 SP2
  • Microsoft SNA Server 4.0 SP1
  • Microsoft SNA Server 4.0
This article was previously published under Q235959

SYMPTOMS

An attempt to reestablish a disconnected session may fail unless the connection is stopped and restarted.

CAUSE

SNA Server does not correlate Host SSCP responses to the original SSCP request if the response is unexpected.

RESOLUTION

To resolve this problem, obtain the latest service pack for SNA Server version 4.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article. This problem was first corrected in SNA Server version 4.0 Service Pack 3.

MORE INFORMATION

The symptoms described above can only be seen when the Host is sending an unexpected response.

In the case reported, the message flow looks as follows: 
Host                     SNA Server
===================================
ACTLU RQD       ->

                <-       ACTLU +RSP

                <-       NOTIFY SLU enabled

INITSELF -RSP   ->  
with sense code 0857 0002, SSCP - PLU session not active

NOTIFY +RSP     ->
The message flow shows that the Host is sending an INITSELF -RSP in error, which is unexpected as a Response to a NOTIFY Request. However, SNA Server treats this unexpected Response as a Response to its NOTIFY Request. At this point, the Host and the SNA Server are not synchronized any more as far as this session is concerned.
Modification Type:MinorLast Reviewed:9/22/2005
Keywords:kbHotfixServer kbQFE kbbug kbfix kbQFE kbsna400sp3fix KB235959
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