rabbitmq-server fails to start after hostname has changed for first time

I am using django-celery for my django project. Last day I have changed my computer's hostname (I am using Ubuntu 12.04, edited file '/etc/hostname'), and after next restart django-celery was failing with error Consumer: Connection Error: [Errno 111] Connection refused. Trying again in 4 seconds... After some research on this error I could find that, changing my host name caused this error from [here][1]. My rabbitmq startup log shows file: /var/log/rabbitmq/startup_log Activating RabbitMQ plugins ... ******************************************************************************** ******************************************************************************** 0 plugins activated: ERROR: epmd error for host "jinesh": nxdomain (non-existing domain) My startup_err file is empty. when I run root@jinesh:/home/jinesh# rabbitmqctl list_users Listing users ... Error: unable to connect to node rabbit@jinesh: nodedown DIAGNOSTICS =========== nodes in question: [rabbit@jinesh] hosts, their running nodes and ports: - unable to connect to epmd on jinesh: nxdomain current node details: - node name: rabbitmqctl4956@jinesh - home dir: /var/lib/rabbitmq - cookie hash: RGhmB2JR1LbZ57j7xWWTxg== I hope changing the nodename may fix this issue. But I couldn't found a way to do this. Anyone have idea about how solve this issue? **update** while changing hostname you have to change both `/etc/hostname` and `/etc/hosts` files. I reinstalled rabbitmq and solved this issue, Will answer this question. [1]: https://bugs.launchpad.net/ubuntu/+source/rabbitmq-server/+bug/653405