[RESOLVED] NetStream not playing remote video file

When I try to play a remote video file using the following code, everything works as expected:

Code:

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ns.play("http://mydomain.com/movie.mp4");

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However, when I try to play a video ad from a Yahoo ad server (using the following code) it does not play. No NetStatus events are triggered either, it just appears to die.

Code:

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ns.play("http://theirdomain.com/randomid");

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Could it be that the URL is missing a file extension? Stumped.

I developed a separate bare-bones player to debug and it played just fine, strange.