David Fifield:
Alternatively, we could specify a static port (:9000 instead of :0 in the ClientTransportPlugin line). Then at least it would be just *one* port open permanently. But one of the nice things about automatic port forwarding was that it would be possible not to use a fixed (more easily blockable) port number.
That would prevent multiple users of the Flashproxy bundle on the same network. This makes some little yellow warning lights blink in my head. They are labelled “support headache ahead”.