What does the message "Totem is unable to form a cluster because of an operating system or network fault. " mean?

Solution Unverified - Updated -

Issue

  • Cluster is reporting in logs messages like below:
corosync [MAIN  ] Totem is unable to form a cluster because of an operating system or network fault. The most common cause of this message is that the local firewall is configured improperly.

Environment

  • Red Hat Enterprise Linux 6 with High-Availability or Resilient Storage Add-on
  • corosync-1.4.1-4.el6 or newer

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