Since you use as3httpclientlib
that based on Socket
, rather than URLLoader
you should setup socket policy server instead of http one (so your crossdomain.xml
isn't used by flash in this case).
To setup flash policy server you can use perl script from this article http://www.adobe.com/devnet/flashplayer/articles/socket_policy_files.html with policy xml suggested by @Bart Friederichs (with to-ports
attribute)