Note that the IoT Box is only connected with the local machine. Consequently, you cannot access the shell directly from a remote location (through the internet). If you want to access the IoT Box remotely, you can paste the ngrok authentication Token key in the IoT Box's remote debug page as show in the following screenshot. This will enable the TCP tunnel from the IoT Box so you can connect the IoT Box through SSH from anywhere. Learn more about ngrok at https://ngrok.com/: