Why live broadcast can be seen only on my computer? Why not be seen by other computers?

Hello, I have a problem with FMS 4.5! The live broadcast can only see on my computer. When someone tries to view broadcast, on another computer, error occurs #2048 !When I connect from another computer to see broadcast, FMC Console shows me that  the server is connected ,but can not be seen transmission , error occurs #2048 !! I have introduced many variations of file crossdomain.xml in my rootinstall/webroot, taken from here :http://curtismorley.com/2007/09/01/flash-flex-tutorial-how-to-create-a-crossdomainxml-file/

http://www.adobe.com/devnet/adobe-media-server/articles/cross-domain-xml-for-streaming.html

However, the broadcast can be seen only on my computer.Where I'm wrong?

Thanks!

http://www.youtube.com/watch?v=QTnSo2zHOzY