No, there is not, otherwise it would be called Active mode (PORT).
You can certainly limit the range of ports that FlashFXP issues with the PORT command, but this poses an even greater security risk than simply letting your machine establish outbound connections on any/all ports.
I'd like to add that there shouldn't be any risk to your machine or network's security by allowing outbound connections to any/all ports. You may successfully stop a virus or backdoor that is already on your system from "phoning home", but even then, most would probably use port 80. The only time network administrators do this is to prevent students/workers from playing online games or using peer-to-peer software.
You might consider just leaving the wingate open, unless there's some risk that I don't know about.
- Raccoon
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