Basic Rules
iptables -P INPUT DROP
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -A INPUT -p tcp -m multiport --dports 80,443 -j ACCEPT⚠️ Always ensure SSH port is allowed before applying a DROP default policy.