![]() All unnecessary services running on the machine can leave ports open and accessible to potential attackers. ![]() One of the easiest ways to secure open ports on Linux is to block unnecessary services on the host computer. Use the following command to list all the open network connections – sudo lsof -i -P -n | grep LISTEN Block Unnecessary Services on the Host System We can also use lsof, a command-line utility, to find all open ports on our Linux server. Zenmap scan open ports Use lsof to find open ports Once installed, enter the target IP address to scan all open ports. Zenmap is available in almost all Linux distributions repository, so use the package manager to install it. Scanning open ports with nmap is not too complicated but if you want even an easier tool, then use Zenmap, the graphical interface for nmap. Use nmap to find all open ports nmap 127.0.0.1 Use Zenmap to find all open ports You can then use this information to configure the firewall on the Linux system to block all unnecessary ports. You want to find out the open ports, you can use a tool like nmap to scan your computer for open ports. This will allow you to ensure those ports are secure and all open ports are necessary and have minimal security risks. It is very important to know what ports are open on the computer. Learn the steps necessary to ensure that your Linux computer has its ports securely open, such as finding which ports are open and configuring them to be secure. Securing open ports on a Linux computer is an important part of keeping it safe from potential threats.
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