Flash 7’s security model provides a way for servers to authorize your Flash .swfs to load data from them, however, you might run into a host that uses IP based access control.

Old tried and true methods still work – routing your Flash data requests thru a ?Proxy? hosted on the same server as your .swf. This is especially handy when you need to communicate, using XML-RPC, with a remote host somewhere. Apache provides a handy XmlRpcProxyServlet that fits the bill.