Why is LoadVars() in FlashLite 3 SWF running on Nokia Remote Device Access not returning variables

Question

I am trying to debug a FlashLite 3 application that uses LoadVars.sendAndLoad() to contact a server and return variables from a PHP page. When I run this in Adobe device central it works ok but when I install the SWF on a phone at Nokia Remote Device Access service and output the results of the resultVars I get nada... here is my code -

sendVars = new LoadVars();
resultVars = new LoadVars();
sendVars.sendAndLoad("http://...", resultVars, "POST");
resultVars.onLoad = Delegate.create(this, respondToLogin);

private function respondToLogin(success:Boolean):Void{
 // When i trace out I get success = false in Nokia Remote Device Access
 // and expected vars are not present
}