Limit ssh access by IP address nano /etc/hosts.allow sshd : localhost : allow sshd : 192.168.0. : allow sshd : 99.151.250.7 : allow sshd : mydomain.net : allow sshd : ALL : deny   Enable SSH root login (Ubuntu) nano /etc/ssh/sshd_config Change line: FROM: PermitRootLogin prohibit-password TO: PermitRootLogin yes sudo systemctl restart sshd   Restrict SSH to one interface nano…