Has anyone been able to successfully implement a service to serve the required socket policy file to FlashPlayer?

I am running the Python implementation of the service provided by Adobe at

http://www.adobe.com/devnet/flashplayer/articles/socket_policy_files.html

and using the following policy file:

<?xml version="1.0" encoding="UTF-8"?>
<cross-domain-policy>
 <site-control permitted-cross-domain-policies="master-only"/>
 <allow-access-from domain="*" to-ports="*" secure="false"/>
</cross-domain-policy>

and receiving this message from Flash:

[SecurityErrorEvent type="securityError" bubbles=false 
cancelable=false eventPhase=2
text="Error #2048: 
Security sandbox violation: http://www.mapopolis.com/family/Tree.swf   
cannot load data from www.mapopolis.com:1900."]

Thanks.