Ubuntu Server Hardening — Part 1: The Essentials
The three measures every public Ubuntu server needs within the first hour: a default-deny firewall with UFW, brute-force protection with Fail2ban, and automatic security updates.
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Ubuntu
2 articles
How to Secure SSH Access on Linux (Ubuntu)
Harden your Ubuntu server's SSH access step by step: create and deploy an SSH key pair, add a sudo user, disable password authentication, and lock out root.
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