SSH Security Settings

1. Connect to the server via SSH or access the shell on the console.
2. Type sudo nano /etc/ssh/sshd_conf.
3. Scroll to the bottom of the file.
4. Add the following lines:

   Ciphers aes128-ctr,aes192-ctr,aes256-ctr

   MACs hmac-sha1,umac-64@openssh.com,hmac-ripemd160

5. Press CTRL-X.
6. Enter Y to save changes.
7. Do not change the name of the file, and press Enter to save.
8. Type sudo service ssh restart.