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Ok, thanks. I'll have a look at both, and in the meanwhile, will carry on learning a beat more about this security Linux "world".

pludi, thanks a lot for your answer. What you've said about that site, is in line with a few pieces and beats I had read, here and there. Anyway, I thought the above mentioned test was accurate,...

You are totally right. There's some typos at my post.

"First, what's the "Stealth Up" test? Never heard of it."
What I wanted to mean is a test under (or linked by) "grc dot com". They call it...

ipables - stealth port 80

This is how I did set up my iptables. It's basic, easy and simple, but it suits my needs.

iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -m conntrack...