Configuring SSH Server on Debian or Ubuntu

You can configurate the SSH Server on Debian/Ubuntu VPS by doing the following:

1. The default SSH server configuration file is /etc/ssh/sshd_config. You need to edit this file using a text editor such as VI using the following command:

   # vi /etc/ssh/sshd_config

2. To disable root logins, edit or add the following line:

   PermitRootLogin no

3. To allow only specific users over SSH add the following line:

   AllowUsers bob john

4. Change the listening port of SSH service add the following line:

   Port 11111

5. Save and close the file.
6. Restart the SSH service to reflect the changes using the following command:

   # service sshd restart

Congratulations, you have configured the SSH Server on Debian/Ubuntu VPS.