Firestarter problems : Insufficent privileges + visudo error + Error reading /proc/ne

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http://forums.fedoraforum.org – Hi all , i try today to install Firestarter , unfortunately i got some problems regarding of the following messages: 1- insufficient privileges : 2- how can i change and save the file /etc/sbin/firestarter with visudo cammand 3-i got this message when i try to run it through terminal Error reading /proc/net/ip_conntrack: No such file or directory what can i do ? i try google last hours (HowTos)