Block access to specific port
I wanted to block specific port in my webserver and whitelist my IP address. To achieve that I used:
iptables -A INPUT -p tcp --dport 8080 -s 1.2.3.4 -j ACCEPT iptables -A INPUT -p tcp --dport 8080 -j DROP
In this example IP is: 1.2.3.4
Port: 8080