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check rabbit-mq status and rabbit-mq logs.check the rabbit-mq credential in nova configuration file .some times restarting rabbit-mq will fix the problem, restart rabbit-mq by service rabbitmq-server restart.

create another rabbit-mq user and change rabbit-mq credentials in config files and try

rabbitmqctl add_user openstack RABBIT_PASS

rabbitmqctl set_permissions openstack ".*" ".*" ".*"

check the transport url in nova config file