I'm using port 80, alls working fine now!80 http ?
21 ftp ?
23 ssh ?
I think, not really sure after a long day at work. Does it need to be a secure port ?
all ports should be open on a web server.
That would defeat the whole purpose of having a firewall and leave a server a sitting duck for all sorts of hack attacks.
However I will conceed for shared hosting a firewall might be handy to limit outgoing connections alright.
It might be handy?
You have no idea!
Got fed up of people port scanning the world then?