You can use any ports in the range of 20300 - 21589 [last I checked unassigned] just have to forward them in the router to your machine. say you listen on port 21021 and use ports 21022 - 21100 for passive transfer. Then you would forward 21021 - 21100 to your machine. Set server up to listen on 21021 with passive ports 21022 - 21100. Only trouble you will run into going non standard ports is when client and server are both behind a router, FlashFXP and UltraFXP overcome that.
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