Malformed MSBD Packet Causes Windows Media Encoder to Fail

Article translations Article translations
Article ID: 264133 - View products that this article applies to.
This article was previously published under Q264133
This article has been archived. It is offered "as is" and will no longer be updated.
Expand all | Collapse all


The Microsoft Windows Media Encoder formats digital content into a streamable format. If a malformed (bad) Media Streaming Broadcast Distribution (MSBD) request is sent to the Media Encoder, a malicious user can cause the service to fail. Although, this doesn't directly affect the Windows Media Server, it can interfere with any real-time broadcasts.


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:;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:
   Date      Time    Version      Size    File name     Platform
   6/2/2000  6:58PM  1,021K  NsRex.exe     x86



Microsoft has confirmed that this is a problem in Windows Media Tools versions 4.0 and 4.1.


Article ID: 264133 - Last Review: February 28, 2014 - Revision: 2.5
  • Microsoft Windows Media Tools 4.0
  • Microsoft Windows Media Tools 4.1
kbnosurvey kbarchive kbhotfixserver kbqfe kbbug kbpending KB264133

Contact us for more help

Contact us for more help
Connect with Answer Desk for expert help.
Get more support from