Connecting to remote servers (HTTP GET, POST)

Hi,

I'm running FMS 3.5 on RedHat, and have some server side actionscript that is attempting to perform an HTTP GET on a remote URL, e.g:

loadVars.send("http://someurl/");

This works on a Windows XP development server, but not on the RedHat deployment server. Are there any configuration options that I need to be aware of in order to allow my application to perform requests such as these (i.e. HTTP requests to remote servers)?

Thanks.