无法使用AS3连接到Java服务器

package
{

    import flash.net.XMLSocket;
    import flash.events.*;
    import flash.display.MovieClip;

    public class test extends MovieClip 
    {

        public function test()
        {
            trace("pouet");
            var xmlsock:XMLSocket = new XMLSocket(); 
            xmlsock.connect("127.0.0.1", 18000);
            var xmlFormattedData = new XML('<message pseudo="Nix" value="Coucou !"/>'); 
            xmlsock.send(xmlFormattedData);
            xmlsock.addEventListener(DataEvent.DATA, onData);
            xmlsock.addEventListener(IOErrorEvent.IO_ERROR, ioerror);
            xmlsock.addEventListener(SecurityErrorEvent.SECURITY_ERROR, secuerror);
            xmlsock.send(xmlFormattedData);

        }

        private function onData(event:DataEvent):void 
        { 
            trace("[" + event.type + "] " + event.data); 
        }


        private function ioerror(event:IOErrorEvent):void 
        { 
        trace(event);
        }

        private function secuerror(event:SecurityErrorEvent):void 
        { 
        trace(event);
        }

    }

}