Do you actually need the playlist part? Could you just disassemble the file and do a redirect?
How about turning it into an m3u instead of a pls?
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The only player that will play .pls is winamp, If your wanting to have it play on a website then you need a windows media player script, and in that script will be a bit where you but http://your-ip:port but I would not recommend using your own IP if you have bought a shoutcast server then you can use servers IP, but if your using free shoutcast might be more difficult. If your wanting to broadcast with shoutcast then you will proberly be better with winamp and getting the pluggin for it and then doing what I said to get it on website.
Hope this helps if not let me know.
Is the ip address local e.g. 192.168 etc. as if so thats proberbly why and in which case you will need to change it to your own ip and change that in the flash player code, other then that only other is if your working behind a router you may need to open the port your using on the routers configeration.