DOCUMENT:Q216711 11-JUN-2002 [sna] TITLE :After SDLC Outage, SNA Server Takes 5-10 Seconds to Recover PRODUCT :Microsoft SNA Server PROD/VER:WINDOWS:3.0,3.0SP1,3.0SP2,3.0SP3,4.0,4.0SP1,4.0SP2 OPER/SYS: KEYWORDS:kbsna300sp4fix kbsna400sp3fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, versions 3.0, 3.0SP1, 3.0SP2, 3.0SP3, 4.0, 4.0SP1, 4.0SP2 ------------------------------------------------------------------------------- SYMPTOMS ======== IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base: Q256986 Description of the Microsoft Windows Registry After receiving an outage (connection failure) from the IBM SDLC link service, SNA Server takes from 5 to 10 seconds before posting a CLOSE(LINK), and subsequent new OPEN(LINK) to retry connection activation. During this time, the host may stop retrying the PU, and may set the PU to an inactive status, requiring manual host intervention to recover the SDLC connection. CAUSE ===== SNA Server intentionally delays SDLC connection recovery to ensure that the SNA Server DACTPU reply has an opportunity to be sent by the link service to the host. However, in a certain customer environment, this 5 to 10 second delay exceeded the host's SDLC connection recovery time period. RESOLUTION ========== SNA Server 4.0 -------------- 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 SNA Server 3.0 -------------- To resolve this problem, obtain the latest service pack for SNA Server version 3.0. For additional information, please see the following article in the Microsoft Knowledge Base: Q184307 How to Obtain the Latest SNA Server Version 3.0 Service Pack STATUS ====== Microsoft has confirmed this to be a problem in SNA Server 3.0 (SP1-SP3) and SNA Server 4.0 (SP1-SP2). This problem was first corrected in SNA Server version 3.0 Service Pack 4 and SNA Server version 4.0 Service Pack 3. MORE INFORMATION ================ WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk. After this hotfix is applied, the NoSDLCOutageTimer registry parameter must be added to eliminate the SDLC connection recovery period. Follow these steps to add this registry value: 1. Start Registry Editor (Regedt32.exe). 2. Locate the following key in the registry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SnaServr\Parameters\ NOTE: The above registry key is one path; it has been wrapped for readability. 3. On the Edit menu, click Add Value, and then add the following registry value: Value Name: NoSDLCOutageTimer Data Type: REG_SZ Value: (the presence of the registry key enables support) 4. Quit Registry Editor. Additional query words: ====================================================================== Keywords : kbsna300sp4fix kbsna400sp3fix Technology : kbAudDeveloper kbSNAServSearch kbSNAServ300 kbSNAServ400 Version : WINDOWS:3.0,3.0SP1,3.0SP2,3.0SP3,4.0,4.0SP1,4.0SP2 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.