So your services are accessed as http://instance/arcgis/rest/services/... (not using a port number, and not using httpS)?And you can see the crossdomain file at http://instance/crossdomain.xml ?
I tried creating an application with Flexviewer using an .sd file inside of our firewall on our local ArcGIS Server instance and was able to create the same error. I've come to the conclusion that publishing a service using an .sd file is not compatible with ArcGIS Viewer for Flex.
It sounds like a crossdomain issue.The crossdomain.xml file needs to be on the server with your application is trying to access, i.e. your amazon instance.See http://resources.arcgis.com/en/help/flex-api/concepts/index.html#/Deploying_an_application/017p00000019000000/
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