Install GUI Setup Tools on CentOS 6.x

# yum install setuptool system-config-securitylevel-tui authconfig system-config-network-tui system-config-firewall-tui ntsysv system-config-keyboard

To correct Firewall Configuration Error:

# yum install dbus
# service messagebus start
Starting system message bus: [ OK ]
# chkconfig messagebus on

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