What is the lightest weight free firewall software?

[Spaceboy]

Look'n'Stop

[Prophet]

Outpost Firewall it'a a good one !

[bhghomg]

Comodo for me

[bonkers]

comodo is the one for me also

[Cabalo]

Windows firewall?
It blocks all inbound connections, as it's necessary.

Windows 7 firewall even blocks outbound connections too, so I haven't any real need for any other one.
A firewall is what it is: a filter. If you know what you're doing, any firewall will do, happens the same with iptables in debian distros.

[anon]

Windows firewall?

A shame that firewall leak tester site is no more. We could have checked if the Windows FW is that good.

[bluegene]

How about the windows firewall, you can't go any lighter than that.

[Cabalo]

Windows firewall?

A shame that firewall leak tester site is no more. We could have checked if the Windows FW is that good.

I'm talking about the windows 7 firewall + DEP that is installed out of the box.

[anon]

I see, but what I meant is that there was this site where you could check if your firewall protected you against a lot of different attacks and leaktests:
http://www.firewallleaktester.com/

It's down now, but if it was up we could test how effective the Windows Firewall really is. Unless someone else knows a similar one (this wasn't just a port scanner, it tested 20+ common FW vulnerabilities, Outpost passed all tests).

[Cabalo]

I remember using that site back in the day. And it didn't exactly made a port scan, it tested for services running in the background that could remotely be accessed. Since Windows Vista and DEP, all is changed.