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Fail2ban — Protect SSH and Web Services from Brute Force

Install, configure, and operate fail2ban to automatically block malicious IP addresses attempting brute-force logins.

UFW Basics — Default-Deny Firewall on Ubuntu & Debian

Step-by-step beginner guide to configuring Ubuntu's Uncomplicated Firewall (UFW), command breakdown, rules, port syntax, and avoiding SSH lockout.