Flash & Php

I’ve made a simple form in flash that sends it’s values to a PHP file on an other server. The problem is that when I upload this swf on my own server it doesn’t work anymore (it worked fine when I tested the movie in Flash), there is nothing wrong with the PHP 'cause I made the same form in HTML and that worked. The flash file is probably correct because I used this tutorial. What should I do to fix it?

Greetz Jakke