[ovirt-users] Ovirt-engine - 404 not Found

Hey Guys, i worked with an ovirt envirnoment the last Weeks. Everythink worked fine until i reboot the Manager. When i access the GUI i recive - 404-not Found When i restart the engine it seems to stop at 2017-09-05 13:43:33,491+02 INFO [org.ovirt.engine.core.bll.ServiceLoader] (ServerService Thread Pool -- 58) [] Start org.ovirt.engine.core.bll.EngineBackupAwarenessManager@6c8b0514 attached u can find the logs Thanks a lot - The Cluster is very important. i got a backup but need to know why it stopped