Hello everybody I am facing the following issue currently. I am trying to add a new physical host to our cluster via oVirt Management Engine Web GUI. Apparently communication between oVirt Engine and the corresponding host is working well, since all necessary packages will be installed successfully. But after a while the installation process fails with the error "No Route to Host" and the host ends up in state "non operational". I checked the network interfaces via Web GUI (Host -> Network Interfaces -> Setup Host Networks) and none of the interfaces are present. In my opinion this is the main problem. It seems the interfaces are not being recognized. I tried using a bond interface and a single interface with static configuration (IP, DNS, Gateway). None of them worked. Further Log Errors: WARN [org.ovirt.engine.core.vdsbroker.VdsManager] (EE-ManagedThreadFactory-engine-Thread-1688) [] Host 'HOSTNAME' is not responding. ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.GetCapabilitiesAsyncVDSCommand] (EE-ManagedThreadFactory-engineScheduled-Thread-50) [] Command 'GetCapabilitiesAsyncVDSCommand(HostName = HOSTNAME, VdsIdAndVdsVDSCommandParametersBase:{hostId='08b7051f-fb49-4df1-8fc4-55b109064b04', vds='Host[HOSTNAME,08b7051f-fb49-4df1-8fc4-55b109064b04]'})' execution failed: java.net.NoRouteToHostException: No route to host ERROR [org.ovirt.engine.core.vdsbroker.monitoring.HostMonitoring] (EE-ManagedThreadFactory-engineScheduled-Thread-50) [] Unable to RefreshCapabilities: NoRouteToHostException: No route to host WARN [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engineScheduled-Thread-46) [3ca7e6f1] EVENT_ID: VDS_SET_NONOPERATIONAL_NETWORK(519), Host does not comply with the cluster Cluster networks, the following networks are missing on host: 'inet,inet-customers,inet-hosting,net1,net3,net38,net-hosting,ovirtmgmt' ERROR [org.ovirt.engine.core.bll.job.ExecutionHandler] (EE-ManagedThreadFactory-engineScheduled-Thread-46) [3ca7e6f1] Exception: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: javax.resource.ResourceException: IJ000457: Unchecked throwable in managedConnectionReconnected() cl=org.jboss.jca.core.connectionmanager.listener.TxConnectionListener@20050329[state=NORMAL managed connection=org.jboss.jca.adapters.jdbc.local.LocalManagedConnection@48465810 connection handles=0 lastReturned=1538703578989 lastValidated=1538703000851 lastCheckedOut=1538703278635 trackByTx=false pool=org.jboss.jca.core.connectionmanager.pool.strategy.OnePool@17388824 mcp=SemaphoreConcurrentLinkedQueueManagedConnectionPool@4eb14706[pool=ENGINEDataSource] xaResource=LocalXAResourceImpl@65d3b585[connectionListener=20050329 connectionManager=1fe5192 warned=false currentXid=null productName=PostgreSQL productVersion=9.5.9 jndiName=jav a:/ENGINEDataSource] txSync=null] I am using oVirt Open Virtualization Manager Version 4.2.2.6-1.el7.centos. OS Version: RHEL - 7 - 4.1708.el7.centos (also tested with CentOS 7.5) OS Description: CentOS Linux 7 (Core) KVM Version: 2.9.0 - 16.el7_4.14.1 LIBVIRT Version: libvirt-3.2.0-14.el7_4.9 VDSM Version: vdsm-4.20.23-1.el7.centos Any hints and suggestions are very appreciated! Thanks in advance. Chris