XML sandbox issue?

My source is attached. I have a little application I am going to give to one of my clients…

My problem is that I want the utility to check back to my site on startup and get an XML document (http://members.cox.net/flashtesterdev/lixlpixel.xml) and check the movies version number, which i assigned, with the latest version number which is located in the XML file…

When I run the movie on my machine connects and no problems…but when I stick it on my web server it is unable to connect to my site remotely and so it throws the error (you can check out what it does here).

Is this some sort of sandbox issue or something a matter with my code?