DOCUMENT:Q235959 08-MAY-2002 [sna] TITLE :SNA Server Fails to Reestablish Session Under Certain Conditions PRODUCT :Microsoft SNA Server PROD/VER:WINDOWS:4.0,4.0 SP1,4.0 SP2 OPER/SYS: KEYWORDS:kbsna400sp3fix sna4 kbsna400sp1 kbsna400sp2 ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, versions 4.0, 4.0 SP1, 4.0 SP2 ------------------------------------------------------------------------------- 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, please see the following article in the Microsoft Knowledge Base: Q215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack STATUS ====== Microsoft has confirmed this to be a problem in Microsoft SNA Server, versions 4.0, 4.0SP1, 4.0SP2. 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. Additional query words: reconnect hangs correlator sequence ====================================================================== Keywords : kbsna400sp3fix sna4 kbsna400sp1 kbsna400sp2 Technology : kbAudDeveloper kbSNAServSearch kbSNAServ400 kbSNAServ400SP1 kbSNAServ400SP2 Version : WINDOWS:4.0,4.0 SP1,4.0 SP2 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. Copyright Microsoft Corporation 2002.