iptables -A INPUT -p tcp --dport 19999 -s 127.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 19999 -j REJECT --reject-with icmp-port-unreachable
iptables -A INPUT -p tcp --dport 19999 -s 127.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 19999 -j REJECT --reject-with icmp-port-unreachable