Flash Player 9 (version 9.0.124.0 and above) implements a strict new access policy for Flash applications (such as chat clients or games) that make Socket or XMLSocket connections to a remote host. It now requires the presence of a socket policy file on the server. (This means you need to have control of the server in order to implement these changes. If you've written a flash app that makes a connection to a server you don't own, you're out of luck, unless that server sets up their own socket policy.)
In earlier versions of Flash Player, if the server didn't have a socket policy, your Flash application could still connect. Now if there's no policy, your application will not connect.
--disable-log Disable logging
--help|-? Show this help
--log_file|-l File to write logs
--domains|-d Access domains
--verbose|-v Print log messages to screen