None.
As you will never execute anything, or install anything you have downloaded on your seedbox, it is just a way of transferring files which after all will remain in their propriety format, then they are not needed.
Anything you do want to install check on your home PC first that it is ok & clean, then FTP to your seedbox, but the only things are trivial stuff like PAR2 repair & winrar & a NG client maybe?
There is already a "hardware" firewall, you are running on a box on a server in a data centre,so nothing gets in, and you have no need to forward any ports, all ports are open.
And great lurking skills you have
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