On Mac OS X Leopard, how can I setup an web server (nginx) without being blocked by the Firewall?
server {
    listen       80 default_server;
    listen       10080 default_server;
    listen       443 default_server ssl;
    listen       10443 default_server ssl;

    ...
}

fwd 127.0.0.1,10080 tcp from any to me dst-port 80
fwd 127.0.0.1,10443 tcp from any to me dst-port 443

sudo sysctl -w net.inet.ip.forwarding=1

net.inet.ip.forwarding=1