Hmm, that is a bit odd. The firewall bypass server runs on port 80...same as websites. I'm not sure what kind of business it is or what kind of network they have, but would it be possible that they have other methods of filtering out content like streaming media?
Another thing to try would be
this link in your media player however it's a longshot that this one would work and the other not.
Which media player do you use? If Winamp, VLC, or another Ogg Vorbis supporting one, have you also tried the Ogg Vorbis listen links on the listen page?
-Mark