DOCUMENT:Q168546 27-JUL-2001 [sna] TITLE :Access Violation May Occur After Upgrading to 3.0 SP1 PRODUCT :Microsoft SNA Server PROD/VER:WINDOWS:3.0 SP1 OPER/SYS: KEYWORDS:kbnetwork kbBug kbISS ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft SNA Server, version 3.0 SP1, on platform(s): - the operating system: Microsoft Windows NT ------------------------------------------------------------------------------- SYMPTOMS ======== After upgrading SNA Server 3.0 with Service Pack 1, the SnaBase or SNA Server service may fail unexpectedly with an access violation or SNA Server may unexpectedly stop accepting new client connections. This problem can occur if SNA clients are connecting to the server over MS Networking (named pipes) or Netware IPX/SPX. A Drwtsn32.log entry may be generated when this failure occurs, indicating a FAULT in the top-level routine along with the following stack-back trace (which may vary): - snalm!QueueBuffer or - ntdll!RtlAllocateHeap snalm!GetReadBuffer snalm!AceptConnection snadmod!AcceptClientConnection snadmod!DMODServiceThread or - ntdll!RtlDestroyHeap ntdll!RtlFreeHeap snalm!CleanupConnection snalm!CloseConnection snadmod!CloseLtab snadmod!IoThread or - security!NtLmSspControl security!DeleteSecurityContext snalm!CleanupSecurityContext snalm!CloseConnection snadmod!sepdnhpe If new clients cannot connect, the SNA Server or SnaBase internal trace may indicate the following error after accepting a new client connection: ACCPT HeapAlloc failed, rc 0 CAUSE ===== SnaBase or SNA Server memory local heap corruption is occurring within the IO completion port handling of named pipe or IPX/SPX clients. RESOLUTION ========== The SNA Server has been updated to correct this problem. STATUS ====== Microsoft has confirmed this to be a problem in Windows NT SNA Server version 3.0 Server Pack 1. This problem was corrected in the latest SNA Server version 3.0 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 Additional query words: ====================================================================== Keywords : kbnetwork kbBug kbISS Technology : kbAudDeveloper kbSNAServSearch Version : WINDOWS:3.0 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.