sudo nvim /etc/ssh/sshd_config
Port 33322
sudo systemctl restart sshd
CentOS/RHEL/AlmaLinux
sudo dnf install fail2ban
Avvia e abilita all’avvio
sudo systemctl enable –now fail2ban
[DEFAULT] bantime = 1h findtime = 10m maxretry = 3 ignoreip = 127.0.0.1/8 ::1 93.35.140.145 banaction = firewallcmd-rich-rules # se usi firewalld
[sshd] enabled = true port = 33322 backend = systemd maxretry = 3 bantime = 1h findtime = 10m
sudo systemctl restart fail2ban sudo fail2ban-client status sshd