Why would someone be unable to hear my music?

Instead of running some radio stream I scripted myself a gadget on my land that calls individual mp3 files from my own web space, changing the URL to the next file after each song.

This works great for almost everyone, but I have one friend who is unable to hear my music. She can hear the music fine everywhere else, and she can hear fine on my land too when I switch to some normal stream, but she can't hear the mp3 files I'm streaming from my web space. Everyone else can.

What might cause this? She's running Windows 7 and has iTunes and Media Center installed.

Thanks!

Dylan

Pass her a couple of the URLs to try in those other programs, Do they work there for her? Maybe one of the other programs will hand over an error message, the SL viewer prefers to keep quiet about audio streams that go wrong.

I'm no expert but it seems to me that some security feature of either Windows 7, her anti virus, anti spy/adware, or firewall might be blocking the "unknown" URL. Or even her ISP. Something to look at anyway.