Microsoft KB Archive/254285

= Access Violation Occurs in Nsum.exe When Opening/Closing Streams =

Article ID: 254285

Article Last Modified on 9/23/2005

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APPLIES TO


 * Microsoft Windows Media Services 4.1

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This article was previously published under Q254285



SYMPTOMS
An Access Violation error message can occur in the Windows Media Unicast Service (Nsum.exe) when multiple clients are simultaneously trying to connect to a server and open a stream.



CAUSE
A race condition in Nsum.exe causes a freed resource to be referenced when it should not be.



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 has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date        Time    Version      Size      File name   Platform -  14-Feb-00   16:26   4.1.0.3858   439,776   Nsum.exe    Windows NT 4.0 14-Feb-00  16:26   4.1.0.3920   440,800   Nsum.exe    Windows 2000



STATUS
Microsoft has confirmed that this is a problem in Windows Media Services version 4.1.

Keywords: kberrmsg kbbug kbfix kbqfe kbhotfixserver KB254285

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