Hi Neal63,
And why should you do that? If you lower your visors, does that not mean you are less protected, or are these settings that high that part of your services don't work? You should make a design of the firewall, and what it is supposed to do before setting it up, yes, my friend, just on paper! Then if you are aware what is going to happen, according to your best wits, you will start to implement, and then you start to fine tune, after analyzing. You you will get it into your grip, step by step.
It is just with a car, rule one read the manual, if you know what is in the manual, start to act.
friend polonus