I have got an error like

Failed to connect; session timed out.
Ensure that:
1. You compiled your Flash application with debugging on.
2. You are running the debugger version of Flash Player.

when i running my application with debugging mode. after expense some time i realize the problem. in my case the problem was my localhost default ip was changed it was 0.0.0.0 instead 127.0.0.1

so if you find same problem you can changed it to 127.0.0.1. this ip was modified when i apply a patch for adobe cs5.