Am I behind a firewall?

Posted on 2005-04-12
Last Modified: 2010-03-17
I need a simple, foolproof way to test wether the machine I'm sitting at is behind a firewall. Do anyone know about a simple online service or similiar method to test this?
Question by:tunheim
    LVL 27

    Accepted Solution

    You could go to to tell you if your address is changing from inside to outside.  Then go to click on Shields up, then scroll down, and click on shields up again.  This is a free port scanning page - which isn't really an attack, more of a test to see what your vulnerabilities are - if you're clean, then it's a pretty good bet you're behind a firewall.  

    Assisted Solution

    You can also go to This will send useless packets of info to your system to check for any open ports. I suggest you check your windows firewall settings which is located in "Network connections" Right Click on your "network connection" and click on the "advanced tab". This will list whether or not you have the firewall turned on locally. Also, Zone Alarm is a very good way to secure your system or prevent intrusions. However a hareware firewall is the best protection so far.

    Take Care,

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