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hello,

first do check the status of the rabbitmq-server

service rabbitmq-server status

service rabbitmq-server restart this restarts the messaging service.

check the /etc/nova/nova.conf file the username and password must reflect correct here by default the pwd is guest if you changed the change in all corresponding entries and restart rabbitmq-server again.

if the problem is still not resolved check in /etc/keystone/keystone.conf there comment the qpid lines. enable verbose=true and debug=true.

give a try and let me know