Jan 22, 2026 · Therefore, it’s good practice to limit the network traffic that can reach open ports (for example, by using a firewall) and to close any unnecessarily open ports.

Sep 22, 2025 · Learn how to check open ports on Ubuntu Linux using ss, Nmap, and ufw firewall to maintain security. Essential guide for system admins!

Nov 14, 2025 · This blog post aims to provide a detailed overview of open ports in Ubuntu, including fundamental concepts, usage methods, common practices, and best practices.

Jun 14, 2022 · In this tutorial we’ll learn how to check for listening ports, using numerous tools, along with managing ports by allowing or disallowing incoming and outgoing connections.

Nov 30, 2022 · Troubleshooting networks? Here's how to find the open ports and close those open ports in the Linux command line.

Jan 3, 2026 · In this article, we'll look at how to close ports on Linux using iptables, ufw, and see how to check which ports are already open. You will also learn how to close port 80, block all ports except …

I need a command to list all open ports in my PC, and another command to close a port. Any suggestions? I need to close some applications' port.

This document guides you on how to identify and disable unsecured ports on a Linux server using ConfigServer Security & Firewall (CSF). Closing unnecessary and insecure ports is vital for …

Aug 15, 2025 · For instance, port 80 is typically used for HTTP (web browsing), port 443 for HTTPS, port 22 for SSH (secure remote access), and port 25 for SMTP (email sending). Due to their critical …

Jan 28, 2024 · In this guide, we’ve seen how to manage ports in Ubuntu’s Uncomplicated Firewall, from the basics of opening and closing ports to more advanced examples. Knowing how to properly …