ssh configuration files
Default user files
ssh sever system wide configuration file
Private key file format
Secure Shell to administer the remote server. Only root is allowed to access the Shell. Secure Shell can be used to access Remote server management - managing user accounts, managing website accounts, managing server configuration files
If you would like to specify the login names to the server through ssh.
You can edit the sshd_config file in /etc/ssh/sshd_config
Add the following line in the file.
AllowUsers root baskar britto nkutty
If you don’t like to permit the Root login through ssh
Add the following line the sshd_config