Your IP address isn't blocked.
Try the following:
1. Close any open Internet Explorer windows.
2. Start Windows Media Player.
3. Find the "Tools" menu (some WPM skins and display options hide the menu)
4. Select "Options" from the "Tools" menu.
5. Click the "Network" tab near the upper-right corner of the "Options" dialog box.
6. Click the "Configure" button.
7. Make sure the Proxy settings option "Use proxy settings of the Web Browser" is selected (unless you have an unusual situation where media must be streamed via a special proxy server).
8. If you changed the Proxy settings, click Ok, Ok, exit Windows Media Player, go to
http://www.smeter.net/slc/audio.php, and let me know whether that fixed the problem.
-Bob