I am new to Linux.,I just installed Centos 6.2 64 bit on a dell xps 420. I picked virtual server and a couple of desktop packages during the installation and everything seems to work fine, however when I login as root to ssh and try to execute the /etc/sysconfig/system-config-firewall I get permission denied. Also if I try to access through the gui (under system, then administration) there is simply no firewall option there. Is there a package I forgot to install? What am I doing wrong?