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Q145652: Windows 95 RPC Ignores Shutdown Packets

Article: Q145652
Product(s): Microsoft Windows 95.x Retail Product
Version(s): 
Operating System(s): 
Keyword(s): kbnetwork kbpolicy win95 kbRPC kbSDKPlatform kbGrpDSNetkbfixlist
Last Modified: 25-MAR-2002

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The information in this article applies to:

- Microsoft Windows 95 
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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:

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Keywords          : kbnetwork kbpolicy win95 kbRPC kbSDKPlatform kbGrpDSNet kbfixlist
Technology        : kbWin95search kbZNotKeyword3
Version           : :
Issue type        : kbprb

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