windows streaming server issue

[javastring]

got windows 2003 running streaming media server. I can access perfectly fine inside my LAN but have difficulty accessing from outside (WAN).

When accessing from outside my LAN through router it comes up to "Locating media" then gets stuck up on "READY". My upload is 512Kbps and media that i am uploading is of 100Kbps.

What do you think could be wrong?

Thanks,