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Firewall and fail2ban

UFW rules, opening ports, and brute-force protection.

A fresh server is scanned within minutes of going online. The firewall is step one.

UFW

sudo ufw allow OpenSSH
sudo ufw allow 80,443/tcp
sudo ufw enable
sudo ufw status verbose

fail2ban

sudo apt install fail2ban -y
sudo systemctl enable --now fail2ban
sudo fail2ban-client status sshd

Changing the SSH port

A non-standard port cuts down the noise from automated scanners.

⚠️ Open the new port in the firewall before changing it, or you will lock yourself out.

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