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After system reboot, Unable to estabilish connection error(devstack)

Initially Openstack was working fine. When I rebooted the system, I cannot access any of the openstack commands.

I tried the following commands:

glance image-list
openstack server list

throws the following error:

Error finding address for Unable to establish connection to HTTPConnectionPool(host='', port=9292): Max retries exceeded with url: /versions (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7f4ac1f6d050>: Failed to establish a new connection: [Errno 111] Connection refused',))

Please anyone help to fix this issue. Thanks in advance.