Use the PORTCOMMANDPORT statement to specify what range of port values the server accepts as a parameter for the PORT or EPRT command.
.-PORTCOMMANDPORT UNRESTRICTED------. >>-+-----------------------------------+----------------------->< '-PORTCOMMANDPORT--+-UNRESTRICTED-+-' '-NOLOWPORTS---'
PORTCOMMAND ACCEPT
PORTCOMMANDPORT NOLOWPORTS
When PORTCOMMAND is set to REJECT, all PORT and EPRT commands are rejected. PORTCOMMANDPORT and PORTCOMMANDIPADDR settings are disregarded.