Windows Media Player 11 fails to authenticate with proxy (ISA)

Posted by Ed Manet on Super User See other posts from Super User or by Ed Manet
Published on 2011-06-10T20:07:04Z Indexed on 2011/06/28 16:24 UTC
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proxy

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windows-media-player

We have some users who need to use a 3rd party site that embeds Windows Media Player streaming video into a web page. Our users go through an ISA proxy server to connect to the Internet. The browser has no problems accessing the site through the proxy.
When Media Player loads, we get prompted for network credentials, but the authentication fails. If we set up Internet Explorer 8 to not use the proxy, Media Player has no problem.

Media Player is configured to use the RTSP/TCP and HTTP protocols, but not the RTSP/UDP protocol. Is this necessary? Is there a registry key I can use to enable it?

Is this more of a proxy server issue? The proxy guy says it's a desktop issue.

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