Create a Secure SSH Server in Ubuntu

Following one of the ways to create a secure ssh server in Ubuntu 8.04 Server.

• Install Ubuntu 8.04 Server
• Change root password
  sudo passwd root

• Add new username
  sudo adduser to2k

• sudo visudo
  Append this line to end of ile
  to2k ALL=(ALL) ALL

• SSH Configuration
  sudo nano /etc/ssh/sshd_config
  Find Port 22 and change number to something different (12345) to make hacking more difficult.
  Set these to:
  PermitRootLogin no
  X11Forwarding no
  UsePAM no
  Append these lines to the very end:
  UseDNS no
  AllowUsers to2k

• • Reload SSH

/etc/init.d/ssh reload

• Test SSH Login

SSH login to your slice to new port, with your new username and password:
– Linux: ssh -p 12345 to2k@192.168.100.100
– Windows: putty to2k@192.168.100.100

If you logged on successfully via your new username: ‘to2k’ – you may close ‘root’ session now.