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GRC (Gibson Research Corporation) provide an external firewall testing tool. It attempts to get into your PC from the internet, hence testing if you are safe behind your internet modem or router.
First you need to start the test, click on https://www.grc.com/x/ne.dll?bh0bkyd2
This page will tell you what the service does and also your name as it appears on the internet.
You need to click the proceed button to allow the site to profile you. If GRC did this without your permission, it would be considered illegal. they need you to give them permission. (This is not dangerous in anyway). On the next page you enter Shields Up. This is the testing software.
There are a lot of explanations on this page.
the basic services I use are the "common ports" test. Clicking this will now trigger their remote test computer to attempt to contact your PC and see if anyone can hack you.
If the results tells you that you are stealth, that is very good. If it can see a port but it is closed, that is not to bad but not as good as stealth. If it tells you the port is open, you need to figure out why. That is an attack point on your system.
Typically servers will have some ports open but home users should have relatively low numbers of ports open, if any at all.
From the previous page, there is also a file sharing test. It tried to connect to your files from the internet. This test should fail.
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