DOCUMENT:Q145652 25-MAR-2002 [win95x] TITLE :Windows 95 RPC Ignores Shutdown Packets PRODUCT :Microsoft Windows 95.x Retail Product PROD/VER:: OPER/SYS: KEYWORDS:kbnetwork kbpolicy win95 kbRPC kbSDKPlatform kbGrpDSNetkbfixlist ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows 95 ------------------------------------------------------------------------------- SYMPTOMS ======== When you are running a program using RPC in Windows 95, the program may report a packet integrity error or security interface error when the program receives a "Shutdown" packet from the RPC server. This error is most likely to occur with a program that uses the Microsoft Security Support Provider interface, and to be reported as a security validation error. CAUSE ===== The RPC run-time library in Windows 95 ignores Shutdown packets, instead of destroying the session and incrementing the received packet count as expected. RESOLUTION ========== STATUS ====== This problem no longer occurs in Windows 98. To resolve this problem, install the current version of Windows. For information about the current version of Windows, visit http://www.microsoft.com/windows. MORE INFORMATION ================ Shutdown packets are specified in the Open Software Foundation (OSF) Distribution Computing Environment (DCE) specification, which defines the industry standard for implementing remote procedure calls (RPC). A DCE- compliant RPC client is expected to terminate the RPC session when it receives a Shutdown packet. In Windows 95, the RPC run-time library does not terminate the session when a Shutdown packet is received. Also, the received packet count is not properly incremented when a Shut- down packet is received. The received packet count (MessageSequenceNumber counter) is used to calculate and validate checksums for programs that use the Microsoft Security Support Provider interface. The RPC run-time library does not calculate checksums correctly because of this error, and checksum validation can fail when called later. Microsoft RPC run-time libraries do not generate Shutdown packets. Only non-Microsoft DCE servers (such as Unix servers) generate Shutdown packets. Additional query words: ====================================================================== Keywords : kbnetwork kbpolicy win95 kbRPC kbSDKPlatform kbGrpDSNet kbfixlist Technology : kbWin95search kbZNotKeyword3 Version : : Issue type : kbprb ============================================================================= 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.