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What is Fail2ban and how does it protect my VPS?
Fail2ban monitors log files and bans IPs that show malicious behavior (failed login attempts, port scans). Install on Connect Quest VPS: `apt install fail2ban`. Default config bans IPs after 5 failed SSH logins for 10 minutes. Configure jails in `/etc/fail2ban/jail.local` for SSH, Apache, Nginx, and cPanel protection.
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