We recently upgraded our QA ovirt installation from ovirt3.6 to 4.0.3. All seems to work fine except when I try to setup network configuration. Even if I take an already configured host and change nothing when I select "Setup Host Networks" and press "ok" the window just hangs (spinning wheel) and task never finishes. I can Delete the job and restart ovirt-engine and all is clean, till I try to setup a network, on any host, again. I haven't found any log entries that seem to apply, but here's the start of the task: 2017-02-21 16:15:35,557 INFO [org.ovirt.engine.core.vdsbroker.vdsbroker.HostSetupNetworksVDSCommand] (default task-40) [77a44650] START, HostSetupNetworksVDSCommand(HostName = webdev3.dev.j2noc.com, HostSetupNetworksVdsCommandParameters:{runAsync='true', hostId='85f43ad0-bba8-46af-97db-062651d23a84', vds='Host[webdev3.dev.j2noc.com,85f43ad0-bba8-46af-97db-062651d23a84]', rollbackOnFailure='true', connectivityTimeout='120', networks='[HostNetwork:{defaultRoute='false', bonding='false', networkName='V102_dev', nicName='enp4s0f0', vlan='482', mtu='0', vmNetwork='true', stp='false', properties='[]', ipv4BootProtocol='NONE', ipv4Address='null', ipv4Netmask='null ', ipv4Gateway='null', ipv6BootProtocol='NONE', ipv6Address='null', ipv6Prefix='null', ipv6Gateway='null', swit chType='LEGACY'}, Where would I look for more info? Another error that is probably related is when I open Setup Host Network and click on the edit pencil I get an error: (ui.log) 2017-02-21 16:33:09,486 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-1) [] Permutation name: EBD94055CA35ABB08F35A7613B98C193 2017-02-21 16:33:09,486 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-1) [] Uncaught exception: com.google.gwt.event.shared.UmbrellaException: Exception caught: (TypeError) __gwt$exception: <skipped>: Cannot read property 'c' of null at Unknown.Ev(webadmin-0.js@25078) at Unknown.Mv(webadmin-0.js@41) at Unknown.X7(webadmin-0.js@19) at Unknown.$7(webadmin-0.js@19) at Unknown.i7(webadmin-0.js@117) ... Caused by: com.google.gwt.core.client.JavaScriptException: (TypeError) __gwt$exception: <skipped>: Cannot read property 'c' of null Did I miss something in the upgrade? ovirt-engine-4.0.3-1.el7.centos.noarch vdsm-4.18.11-1.el7.centos.x86_64 Thanks. -- 'ovirt-engine' and component 'Frontend.WebAdmin'