I dunno. I looks like a security thing to me. The server *IS* responding,
but not sending the stream.

Have you checked this site?

http://www.microsoft.com/windows/windowsmedia/forpros/serve/firewall.aspx

It says you need 1024-5000 outbound UDP opened.

Any chance you're forwarding ports to the wrong server?

First off - have you enabled HTTP streaming ? WMP11 won't be able to
use mms URLs *at all* without HTTP rollover. You can test that by
trying the equivalent RTSP URL to your content.

Secondly - it's not recommended to just open firewall ports here, it's
too complicated a job and the port range would have to be too wide for
client connections to make an effective firewall.

Instead, add the windows media services executable (wmserver.exe) to
the firewall exceptions list, and let the firewall open and close
ports as appropriate based on requests from the service.

http://www.microsoft.com/windows/windowsmedia/forpros/serve/firewall.aspx
says "ou should add the Windows Media Services program (wmserver.exe)
as an exception in Windows Firewall to open the default inbound ports
for unicast streaming, rather than opening ports in the firewall
manually. For more information,"

HTH
Cheers - Neil
------------------------------------------------
Digital Media MVP : 2004-2008
http://mvp.support.microsoft.com/mvpfaqs