Disabling SELinux and iptables in RHEL 6

There is no way to disable SELinux and iptables (firewall) during the Setup Agent in RHEL 6. So you need to do it manually as root.

Disabling SELinux
Modify the /etc/selinux/config file to disable SELinux:
SELINUX=disabled

Disabling iptables
Invoke the GUI tool "system-config-firewall" to disable firewall.