ERROR oslo_messaging._drivers.impl_rabbit [-] AMQP server on <IP Address of RabbitMQ>:5672 is unreachable: [Errno 111] ECONNREFUSED. Trying again in X seconds.

Issue

Following message appears in /var/log/neutron/server.log repeatedly on undercloud (Directror) node.

2016-07-14 22:46:17.853 4673 DEBUG oslo_messaging._drivers.impl_rabbit [-] Received recoverable error from kombu: on_error /usr/lib/python2.7/site-packages/oslo_messaging/_drivers/impl_rabbit.py:810
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit Traceback (most recent call last):
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit   File "/usr/lib/python2.7/site-packages/kombu/utils/__init__.py", line 243, in retry_over_time
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit     return fun(*args, **kwargs)
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit   File "/usr/lib/python2.7/site-packages/kombu/connection.py", line 237, in connect
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit     return self.connection
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit   File "/usr/lib/python2.7/site-packages/kombu/connection.py", line 741, in connection
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit     self._connection = self._establish_connection()
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit   File "/usr/lib/python2.7/site-packages/kombu/connection.py", line 696, in _establish_connection
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit     conn = self.transport.establish_connection()
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit   File "/usr/lib/python2.7/site-packages/kombu/transport/pyamqp.py", line 112, in establish_connection
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit     conn = self.Connection(**opts)
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit   File "/usr/lib/python2.7/site-packages/amqp/connection.py", line 165, in __init__
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit     self.transport = self.Transport(host, connect_timeout, ssl)
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit   File "/usr/lib/python2.7/site-packages/amqp/connection.py", line 186, in Transport
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit     return create_transport(host, connect_timeout, ssl)
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit   File "/usr/lib/python2.7/site-packages/amqp/transport.py", line 299, in create_transport
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit     return TCPTransport(host, connect_timeout)
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit   File "/usr/lib/python2.7/site-packages/amqp/transport.py", line 95, in __init__
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit     raise socket.error(last_err)
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit error: [Errno 111] ECONNREFUSED
2016-07-14 22:46:17.853 4673 TRACE oslo_messaging._drivers.impl_rabbit
2016-07-14 22:46:17.854 4673 ERROR oslo_messaging._drivers.impl_rabbit [-] AMQP server on 192.168.123.1:5672 is unreachable: [Errno 111] ECONNREFUSED. Trying again in 2 seconds.