[ubuntu] GUFW problems

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http://ubuntuforums.org – I have a System76 Lemur Ultra Thin (lemu4) notebook PC and I am using Ubuntu 12.04.1 64 bit Long Term Service. I installed GUFW version 12.04.1 for Ubuntu and I use it to manage my complex list of firewall rules. Every time I switch on the firewall and I modify it, I lose access to the Internet. Every time I switch off the firewall, I regain access to the Internet. I have to reboot my System76 PC to let the new changes to my firewall rules list take into effect so that I can regain Internet access again. Why is this happening? How do I fix this problem so that I can make modifications to my (Hardware)