Using apt i downloaded and installed openssh-server. This programs allow me to have access to the server using secure channel.

Login to the server using putty. Save the session so no need any more to type the server's IP.

Accept the new rsa2 Key that server sent to me.

Login locally to my server.  I am on it.

Change ssh port for security reason

Edit sshd_config file using vi editor.

Change the default port that ssh use.

Restart he services.

Check if the ssh program is listen to a new port using telnet and putty.