Unable to start rabbitmq-server on OpenStack nodes

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Issue

Unable to start rabbitmq server on OpenStack nodes:

attempted to contact: [rabbit@abc,rabbit@xyz]

rabbit@abc:
  * unable to connect to epmd (port 4369) on abc: address (cannot connect to host/port)

rabbit@xyz:
  * unable to connect to epmd (port 4369) on xyz: address (cannot connect to host/port)

Environment

Red Hat Open Stack

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