*Update* it turned out that the tests are lower on that page
so I'll do them with Fedora too.
I used Debian, which I always installed from a minimal system so I never installed network-manager or network services and the ones that came by default I could remove (as Debian breaks up a lot the packages and makes it easier to have only the basics). Then I simply used UFW (UncomplicatedFireWall, from Ubuntu I think) in its default settings.
When I visited https://www.grc.com/x/ne.dll?bh0bkyd2
and ran the test I would get a page with compliments as my computer was sort of 'invisible' to the Internet, with no open services.
I installed F17 from the Xfce spin as the minimal ISO then would fail.
Now I get this when I perform that test: http://www.zimagez.com/zimage/screen...2-120152pm.php
I have removed many networking stuff from the original install which I don't need (vpn, rpc, smb etc.), but I have network-manager and some other things that are sort of un-removable like nss or whatever (I really don't understand about this issue).
I have system-config-firewall set to block everything and allow nothing.
I suspect that I would have to change some default settings so as to pass that test. Can anyone give me some cues?