FMS http connect fail

code is here:

//need to load this library
load( "NetServices.asc" );

var client;
var returnStr;

//this gets call when the application gets instantiated in the comm server
application.onAppStart = function()
{
        trace("-Application has started :::");
}
application.onConnect = function( pClient  ) {
   
    trace("onConnect: "+ pClient );
  
    //application.acceptConnection( pClient );
    this.acceptConnection( pClient );
    client = pClient;
}
Client.prototype.serverHelloMsg = function( helloStr ) {
        trace("serverHelloMsg---");
        trace("IN GET remoting..." );
       
             // We create a new object that will handle the result of the Flash Remoting
             var myResult = new Object();
             // This is the result handler that will execute when the data is loaded in from
             // the Flash Remoting.  To return the data to the client, we execute client.call()
             // which calls the function 'dataFromServer' from NetConnection.client
             myResult.onResult = function (data) {
                   trace("Data received from Server : " + data);
                   returnStr = data;

             };
             // This is the fault handler for the Flash Remoting.  If this is executed it calls
             // a client.call() which calls teh function 'traceFromServer' from NetConnection.client
             // This sends the error message to the trace panel.
           myResult.onStatus = function (info) {
               trace("An error occurred : " + info.description);
                         };

           NetServices.setDefaultGatewayUrl( "http://localhost:8080/flashRemoApp/gateway" );
           trace("Calling flash gateway...");
           var myServer = NetServices.createGatewayConnection();
           trace("Calling createGatewayConnection...");
           var myService = myServer.getService("/flashRemoApp/flashRemoServlet", myResult);
           trace("After getService...");
           myService.flashRemoServlet("testing remoting...");
  
    return "Hello, " + returnStr + "!";
}