Lab stuck at step 5 into iptables

Gets stuck every time at this point in the lab, after typing the drop rule and presing enter the " | " keeps flashing with me unable to type anything else into the terminal, i refreshed the lab 3 times and gets stuck at the same step every time.
CTRL-C not working
after debugging it gets stuck every time i use this command: sudo iptables -A INPUT -j DROP

weirdly after refreshing a few dozen times trying a few dozen solutions, this came back.

even though the lab was refreshed and closed :man_shrugging: :man_shrugging: :man_shrugging: :man_shrugging:

Could you try to switch to our new site
But first you have to create a new account on it using the email you had already used in the old site

I had this same error on the new site.
Until I noticed the following phase in the question:

SSH and HTTP access from caleston-lp10 to work.

Once I allow caleston-lp10 access, I was able to complete the question.

Thanks for sharing @dreday13