User Datagram Protocol does not work with some firewall packet inspection routines (839221)
The information in this article applies to:
- Microsoft Windows Media Player 9 Series for Windows 98 Second Edition
- Microsoft Windows Media Player 9 Series for Windows Millennium Edition
- Microsoft Windows Media Player 9 Series for Windows 2000
- Microsoft Windows Media Player 9 Series for Windows XP
- Microsoft Windows Media Player 9 Series for Windows Server 2003
SYMPTOMSWhen you use Microsoft Windows Media Player to stream media files over a network, the player may stop working after you try to connect to the media files. These media files can include music files or video files.
Sometimes, you do not receive an error message or any other message that indicates that a problem has occurred.
Note This problem does not occur when you play local media files. CAUSEThis problem may occur if a network router or a firewall is blocking packets from the server computer that is running Windows Media Player.
Some firewall inspection routines may block packets from the User Datagram Protocol (UDP) data stream.
If either the router or the firewall blocks either the UDP data stream or the acknowledgment of the client request by the server, Windows Media Player tries to make additional connection requests to the server that is running Windows Media Player.
When no valid information is returned, Windows Media Player stops responding. RESOLUTIONIn some instances, the hardware manufacturer may have a firmware update that corrects the problem. For more information about firmware updates, contact the hardware vendor as described later in this section. Content providers can also author links so that the player tries to roll over to an alternative URL when Windows Media Player does not make a connection. By using failover in the client side ASF Stream Redirector (ASX) file, a content provider can help make sure that you can connect to a stream, as shown in the following code: <asx version = "3.0">
<entry>
<ref href = "mms://SERVERNAME/file.wmv" />
<ref href = "http://SERVERNAME/file.wmv" />
</entry>
</asx> For more information about files that use the ASF Stream Redirector (ASX) file format, see the Windows Media Player 9 Series software development kit (SDK).
For information about how to contact the hardware vendor for your equipment, click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base:
65416
Hardware and Software Third-Party Vendor Contact List, A-K
60781
Hardware and Software Third-Party Vendor Contact List, L-P
60782
Hardware and Software Third-Party Vendor Contact List, Q-Z
Modification Type: | Major | Last Reviewed: | 4/28/2004 |
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Keywords: | kbprb KB839221 kbAudDeveloper |
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