The full log is : 2019-11-06 14:59:57,010+08 ERROR [org.ovirt.engine.core.bll.provider.network.SyncNetworkProviderCommand] (EE-ManagedThreadFactory-engineScheduled-Thread-79) [497583f7] Command 'org.ovirt.engine.core.bll.provider.network.SyncNetworkProviderCommand' failed: EngineException: (Failed with error Connection refused (Connection refused) and code 5050) 2019-11-06 14:59:57,011+08 INFO [org.ovirt.engine.core.bll.provider.network.SyncNetworkProviderCommand] (EE-ManagedThreadFactory-engineScheduled-Thread-79) [497583f7] Lock freed to object 'EngineLock:{exclusiveLocks='[3a2f66a1-82c2-414f-a532-62f6c36389c9=PROVIDER]', sharedLocks=''}' 2019-11-06 15:00:11,996+08 INFO [org.ovirt.engine.core.bll.provider.network.AddNetworkWithSubnetOnProviderCommand] (default task-72) [4117e052-5919-4ca7-aafa-4f34e65ed19d] Running command: AddNetworkWithSubnetOnProviderCommand internal: false. Entities affected : ID: ed88fc90-59d3-4a6a-9a11-c9861a8be95f Type: StoragePoolAction group CREATE_STORAGE_POOL_NETWORK with role type ADMIN