How to Close Unused Ports

Step 1: Identify Unused Ports

sudo ss -tulpn

Step 2: Close Port with UFW

sudo ufw deny 8080/tcp
sudo ufw reload

Step 3: Close Port with iptables

sudo iptables -A INPUT -p tcp --dport 8080 -j DROP

Step 4: Stop the Associated Service

sudo systemctl stop service_name
sudo systemctl disable service_name

Step 5: Verify Port is Closed

sudo nmap -p 8080 localhost