The lab interface hangs after a certain while all the time and due to which I am forced to shut it down. This is generating too many log ins and causing permission denied error. What is the work around? This is not letting me practice with ease and wasting my time.
Do not open more than 3 simultaneous sessions.
Make sure you close the session by typing exit or ctrl+d if you are taking a break for more than 10 minutes
Since the web console is unstable at times. We will highly recommend using any ssh client applications like putty or Cygwin on windows and terminal on Linux and Mac.
Can you confirm what you are learning? I will give you some tips based on what you are learning.