How to Harden Ubuntu 20.04 Server: SSH, Users, Keys, and Firewall

This guide walks through securing an Ubuntu 20.04 server by updating packages, changing the default SSH port, enforcing strong passwords, creating a non‑root user with sudo, disabling root login, enabling RSA key authentication, configuring the UFW firewall, and blocking ping requests.

Linux securityRSA keysSSH Hardening

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How to Harden Ubuntu 20.04 Server: SSH, Users, Keys, and Firewall