Install a Firewall (UFW or firewalld)
Install a Firewall (UFW or firewalld)
Ubuntu (UFW)
apt install ufw -y ufwallowOpenSSH ufw enable
Alma/Rocky (firewalld)
dnf install firewalld -y
systemctl enable --now firewalld
firewall-cmd --permanent --add-service=ssh
firewall-cmd --reload