DOCUMENT:Q195996 24-OCT-2001 [sna] TITLE :SNA Server Incorrectly Handles Cancelled Allocate Requests PRODUCT :Microsoft SNA Server PROD/VER::3.0,3.0 SP1,3.0 SP2,3.0 SP3,4.0,4.0 SP1 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, versions 3.0, 3.0 SP1, 3.0 SP2, 3.0 SP3, 4.0, 4.0 SP1 ------------------------------------------------------------------------------- SYMPTOMS ======== The following symptoms can occur when SNA Server incorrectly handles cancelled allocate requests: - An Advanced Program-to-Program Communications (APPC) or Common Programming Interface for Communications (CPIC) application's call to [MC_]ALLOCATE or CMALLC may hang indefinitely. This may occur after a previous allocation request has been cancelled, or after the SNA Server connection has been restarted. - If an APPC or CPIC application subsequently cancels an outstanding [MC_]ALLOCATE or CMALLC request (by calling the cancel verb, or by calling TP_ENDED, or if the client-server LAN session is lost), the SNA Server may later fail unexpectedly with an access violation (C0000005) in routine s1prfrcb() or s1puc62() as indicated by the Drwtsn32.log entry. The following Knowledge Base article has additional information when this problem results in an access violation in the s1prfrcb() routine: Article ID: Q193659 Title: SNA Server Access Violation in s1prfrcb() CAUSE ===== SNA Server was incorrectly handling the cancellation of a pending [MC_]ALLOCATE or CMALLC request. This caused the SNA Server to prevent unused LU 6.2 sessions from being used. If many cancelled client allocation requests are received, this could lead to an SNA Server access violation. RESOLUTION ========== 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 SNA Server 4.0 -------------- This problem was corrected in the latest SNA Server version 4.0 U.S. Service Pack. For information on obtaining this Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces): S E R V P A C K STATUS ====== Microsoft has confirmed this to be a problem in SNA Server versions 3.0, 3.0 Service Pack 1, 3.0 Service Pack 2, 3.0 Service Pack 3, 4.0, and 4.0 Service Pack 1. This problem was first corrected in SNA Server 3.0 Service Pack 4. Additional query words: ====================================================================== Keywords : Technology : kbAudDeveloper kbSNAServSearch kbSNAServ300 kbSNAServ400 kbSNAServ300SP3 kbSNAServ300SP1 kbSNAServ400SP1 kbSNAServ300SP2 Version : :3.0,3.0 SP1,3.0 SP2,3.0 SP3,4.0,4.0 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. Copyright Microsoft Corporation 2001.