Hi, I have 2 nodes on my OpenStack cluster. One act as both the controller node and the compute node and the other act as the compute node. All services were running well for days until I activate a new NIC interface to the controller node. Now the problem is the nova-compute service of the compute node can connect to the RabittMQ server but the nova-compute service of the controller node connecting to the RabiitMQ server got an error and fails. Here are the RabbitMQ logs when I start nova-compute service on the controller node: =INFO REPORT==== 15-Dec-2018::11:02:15 === Connection <0.3414.0> (192.168.0.31:35254 -> 192.168.0.31:5672) has a client-provided name: nova-compute:7425:5fb041db-c884-4c5a-86a5-6c7a490c2471 =INFO REPORT==== 15-Dec-2018::11:02:15 === accepting AMQP connection <0.3431.0> (192.168.0.31:35256 -> 192.168.0.31:5672) =INFO REPORT==== 15-Dec-2018::11:02:15 === Connection <0.3431.0> (192.168.0.31:35256 -> 192.168.0.31:5672) has a client-provided name: nova-compute:7425:911fbbc4-1cfa-45f2-a65b-23c7fb0a4aee =WARNING REPORT==== 15-Dec-2018::11:02:15 === closing AMQP connection <0.3414.0> (192.168.0.31:35254 -> 192.168.0.31:5672 - nova-compute:7425:5fb041db-c884-4c5a-86a5-6c7a490c2471): client unexpectedly closed TCP connection =WARNING REPORT==== 15-Dec-2018::11:02:15 === closing AMQP connection <0.3431.0> (192.168.0.31:35256 -> 192.168.0.31:5672 - nova-compute:7425:911fbbc4-1cfa-45f2-a65b-23c7fb0a4aee): client unexpectedly closed TCP connection =INFO REPORT==== 15-Dec-2018::11:02:21 === accepting AMQP connection <0.3446.0> (192.168.0.31:35316 -> 192.168.0.31:5672) =INFO REPORT==== 15-Dec-2018::11:02:21 === Connection <0.3446.0> (192.168.0.31:35316 -> 192.168.0.31:5672) has a client-provided name: nova-compute:7438:cac8d67b-6f5a-426d-8d03-a18c8d5a7e5a =INFO REPORT==== 15-Dec-2018::11:02:21 === accepting AMQP connection <0.3463.0> (192.168.0.31:35318 -> 192.168.0.31:5672) =INFO REPORT==== 15-Dec-2018::11:02:21 === Connection <0.3463.0> (192.168.0.31:35318 -> 192.168.0.31:5672) has a client-provided name: nova-compute:7438:b06139fd-8294-4c21-a5c3-6e1ccb45fe6f =WARNING REPORT==== 15-Dec-2018::11:02:21 === closing AMQP connection <0.3446.0> (192.168.0.31:35316 -> 192.168.0.31:5672 - nova-compute:7438:cac8d67b-6f5a-426d-8d03-a18c8d5a7e5a): client unexpectedly closed TCP connection =WARNING REPORT==== 15-Dec-2018::11:02:21 === closing AMQP connection <0.3463.0> (192.168.0.31:35318 -> 192.168.0.31:5672 - nova-compute:7438:b06139fd-8294-4c21-a5c3-6e1ccb45fe6f): client unexpectedly closed TCP connection What is the problem?