Verify open ports on a Linux system

# netstat -tupnl <enter>

This command will show you all the open ports on your system.

Force SSH to ask password when using keys for authentication

This is for those of you who want to know how to force SSH to ask for a password (not the user login password), the one used to create the public and private key pair using OpenSSH.

You can force SSH to ask for the key password by modifying the files /etc/ssh/sshd_config and /etc/ssh/ssh_config. In . . . → Read More: Force SSH to ask password when using keys for authentication

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