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RabbitMQ makes a TCP connection, so my suggestion would be to see if iptables or any firewall is blocking it to make connections. If there is a switch in the topology then there can be a possibility that the switch might dropping the packets.

Secondly Try pinging the controller via its host name from compute node. There is a possibility that the IP of the controller node is not set right in the /etc/hosts file of the compute node.

Finally try to see the status of rabbitMQ on the controller node, weather its running as a server on the controller node and listing to the requests.

Probably you will get the conclusion after this.