Remoting with SWF file

I would like to use flash builder to create SWF files that connects to coldfusion.

This is all local and my file works from the browser, but i would like to import the SWF into mapping softwear to project it.

I get "Send failed, Channel.Connect.Failed error NetConnection.Call.Failed:HTTP:Failed:url: 'http://localhost/flex2gatway/'

Any help would be greatly appriciated Andrew