AS3 - XML Socket only works during compile..?

I wrote a Flash AS 3.0 Preview .fla & .as files that establishes a connection with a C++ server app via an XML Socket. Everything works great when I start the .swf file within Flash 9 Public Alpha by pressing [CTRL]+[ENTER]. But if I close the exported .swf file, and immediately open the file with the standalone Windows Flash 9 Player (I tried it with the player that comes with the Alpha preview and the brand new Player released on Oct 4 on Adobe Labs), no connection to the server is established. What gives?