I have answered questions for a few customers regarding the policy files changes in the recent releases of the Flash Player and have referenced the following documents:

This change in behavior is noted in the following kb article:
Sockets do not function in Flash Player versions later than 9.0.115.0

A good reference on the security changes in the new Flash Player is located here:
Policy file changes in Flash Player 9

The page that is probably of most interest to you is here:
http://www.adobe.com/devnet/flashplayer/articles/fplayer9_security_04.html

This is an article describing how to set up a socket policy file server and provides some samples:
http://www.adobe.com/devnet/flashplayer/articles/socket_policy_files.html

In addition to these articles, I have found 2 more that I personally found useful:

This one shows how to make and use a simple java socket server to act as a policy file server:
AS3 + Java: Socket connections to ports below 1024

This blog post shows how to create a simple java app that tests your socket server:
Flash Player 9 Update 3 and the Socket Policy File

Now if only I could figure out how to easily start the socket server when I start my TOMCAT server up?? Anyone?



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