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ometimes, in our mac machine, our firewall setting is not let us do the changes, and the system not let us allow to do the "Turn On" or "Turn Of", in this we can do turn on the firewall or turn off the firewall by just one command.
Let's see how we can do turn on or turn off the firewall setting by command.

Initial State:

Turn on/off firewall of your mac using terminal/CMD

Turn on by using below command:

sudo defaults write /Library/Preferences/com.apple.alf globalstate -int 1

Turn on/off firewall of your mac using terminal/CMD

Now you can see, your firewall setting has changed:

Turn on/off firewall of your mac using terminal/CMD

Now, for turn off run below command:

sudo defaults write /Library/Preferences/com.apple.alf globalstate -int 0

Turn on/off firewall of your mac using terminal/CMD

Turn on/off firewall of your mac using terminal/CMD

That's it..