DOCUMENT:Q273975  12-JUN-2001  [sna]
TITLE   :Opening Multiple SLI Sessions May Cause Some to Stop Responding
PRODUCT :Microsoft SNA Server
PROD/VER:WINDOWS:4.0,4.0 SP1,4.0 SP2,4.0 SP3
OPER/SYS:
KEYWORDS:kbDSupport kbsna sna4 kbsna400sp1 kbsna400sp2 kbsna400sp3 kbSNA400sp4fix kbSNA400PreSP4

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The information in this article applies to:

 - Microsoft SNA Server, versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3 
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SYMPTOMS
========

If a Win32 SNA Server application opens multiple logical unit (LU) sessions at
the same time by calling SLI_OPEN, some SLI_OPEN requests may stop responding
(hang) and never complete. SNA Application LUA API tracing shows that the
underlying RUI_INIT is completed for every SLI_OPEN that was issued, but one or
more SLI_OPEN requests may fail to complete.

CAUSE
=====

A timing window within the Winsli32.dll code can result in SLI_OPEN hanging if
the RUI_INIT callback happens before the verb returns control.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for SNA Server 4.0. For
additional information, please see the following article in the Microsoft
Knowledge Base:

   Q215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack



WORKAROUND
==========

Reduce the number of SLI_OPEN requests that are issued at the same time, or
serialize all SLI_OPEN requests.

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft SNA Server versions
4.0, 4.0 SP1, 4.0 SP2, and 4.0 SP3.

This problem was first corrected in SNA Server 4.0 Service Pack 4.

Additional query words:

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Keywords          : kbDSupport kbsna sna4 kbsna400sp1 kbsna400sp2 kbsna400sp3 kbSNA400sp4fix kbSNA400PreSP4fix 
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ400 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3
Version           : WINDOWS:4.0,4.0 SP1,4.0 SP2,4.0 SP3
Issue type        : kbbug
Solution Type     : kbfix

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