Thank you for your reply.
The reason that i need to open that port is for a cc payment service that i am using, they require bidirectional traffic available on port 43924.
If i need to open this port with a custom template, does anyone know of a good tutorial on what template to modify and how to modify it?
It's pointless opening a port on the server unless you've added software on the server which listens to that port.
because this port is for cc payment what program/deamon should be listening to this port? and how do i get it to start listening?