Hi, i've upgraded my ovirt installation from 4.1.x to 4.2.. But i have problem with one host. Ovirt said some mandatory network missing, but when i look into network configuration all Physical Card are in RED marked down. But my network is fully operrationnal (can ping). I tried to remove all vdsm relative package and reinstall it manually --> KO I tried to remove host from ovirt, and reinstall it --> KO On "setup host networks" screen all my card indicate "Link Layer Information" not available. Here is the log seems to be relevant (engine.log) : 2018-04-30 15:05:05,053+02 ERROR [org.ovirt.engine.core.bll.SetNonOperationalVdsCommand] (EE-ManagedThreadFactory-engineScheduled-Thread-39) [6372dfc8] Host 'dwalin.cines.fr' is set to Non-Operational, it is missing the following networks: 'dmz_interne,dmz_interne_adm,dns_interne,echange,echange_adm,ldap_interne,pallas_serv,pallas_serv_adm,securite,securite_adm,tiamat' 2018-04-30 15:05:05,079+02 WARN [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engineScheduled-Thread-39) [6372dfc8] EVENT_ID: VDS_SET_NONOPERATIONAL_NETWORK(519), Host dwalin.cines.fr does not comply with the cluster Private networks, the following networks are missing on host: 'dmz_interne,dmz_interne_adm,dns_interne,echange,echange_adm,ldap_interne,pallas_serv,pallas_serv_adm,securite,securite_adm,tiamat' 2018-04-30 15:05:05,085+02 ERROR [org.ovirt.engine.core.bll.job.ExecutionHandler] (EE-ManagedThreadFactory-engineScheduled-Thread-39) [6372dfc8] 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@4372609f[state=NORMAL managed connection=org.jboss.jca.adapters.jdbc.local.LocalManagedConnection@688b1323 connection handles=0 lastReturned=1525093505080 lastValidated=1525093160840 lastCheckedOut=1525093505059 trackByTx=false pool=org.jboss.jca.core.connectionmanager.pool.strategy.OnePool@1d01224a mcp=SemaphoreConcurrentLinkedQueueManagedConnectionPool@bd7a6f0[pool=ENGINEDataSource] xaResource=LocalXAResourceImpl@3343607b[connectionListener=4372609f connectionManager=36e47d0e warned=false currentXid=null productName=PostgreSQL productVersion=9.5.9 jndiName=java:/ENGINEDataSource] txSync=null] (...) Now i really does know what to do. Someone have an idea? Thank you. -- Lionel