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How to secure your SSH.   1. Permanently stop and disable ssh services (ubuntu) command: sudo systemctl stop ssh                 sudo systemctl disable ssh                 sudo systemctl status ssh To check if ports 22 still open after disable ssh command : sudo lsof -i:22 * Please run this command from server terminal in nutanix web reference -:  https://www.cyberciti.biz/ faq/howto-start-stop-ssh- server/   2. Reject all IP & accept ssh connection only by allow IP Address reference-:  https://docs. rackspace.com/support/how-to/ restrict-ssh-login-to-a- specific-ip-or-host/ 3. Using knockd filter ssh connection by knock port reference-:  https://www. linuxbabe.com/security/secure- ssh-service-port-knocking- debian-ubuntu 4. Using passwordless SSH login reference-:  https://www. linuxbabe.com/linux-server/ setup-passwordless-ssh-login