Culprit to this lovely message during the Validating public and private interfaces across cluster nodes phase was to turn off IPTABLES. On Red Hat 6 or Oracle Linux 6, you should have IPTABLES turned off during the installation. Here’s how you can turn off IPTABLES and disable it from re-starting after a reboot:

[root@rac02 ~]# service iptables stop
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]
[root@rac02 ~]# chkconfig iptables off

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