Microsoft KB Archive/235723

= SNA Windows 3.x Client Displays Warning 956, Won't Unload =

Article ID: 235723

Article Last Modified on 9/6/2005

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APPLIES TO


 * Microsoft SNA Server 4.0

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This article was previously published under Q235723





SYMPTOMS
After running one or more 16-bit Windows APPC applications on top of the SNA Windows 3.x client (on a Windows 95 workstation), the Wnap.exe process may display the following error message even though all SNA client applications have ended:

SNA Server Messager

SNA Server Warning 956

SNA Base cannot be terminated while its services are being used.

This problem couldn't be reproduced when running the SNA Windows 3.x client on Windows NT. Traces reveal that the APPC applications are not calling WinAPPCCleanup prior to termination, contributing to the problem.



CAUSE
If an APPC application fails to call WinAPPCCleanup before the process terminates, the SNA Windows 3.x client software relies on the operating system to notify Wnap.exe that the Win16 process has ended. However, when running on Windows 95, this was not occurring properly.



RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later:

NOTE: Because of file dependencies, the most recent fix that contains the preceding files may also contain additional files.



WORKAROUND
For all APPC applications, ensure that they properly call WinAPPCStartup when the APPC process first starts, and WinAPPCCleanup before the process ends.



STATUS
Microsoft has confirmed that this is a problem in Microsoft SNA Server version 4.0.

Keywords: kbbug kbfix kbqfe KB235723

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