Default user: debian
Default password: temppwd
Step 1: Update and upgrade system using
sudo apt-get update
sudo apt-get upgrade
Step 2: Restrict access to local LAN
sudo vi /etc/hosts.deny
ALL: ALL
sudo vi /etc/hosts.allow
sshd: 192.168.0.
Reference: https://www.eliteraspberries.com/blog/2013/09/installing-debian-on-the-beaglebone-black.html