RHEV Manager shows event: Failed to log User null@N/A out.

Issue

• On RHEV Manager events the following message is shown:

2015-May-18, 13:06 Failed to log User null@N/A out.

• On the engine.log file messages similar to :

2015-05-18 12:31:29,216 WARN  [org.ovirt.engine.core.bll.ChangeVMClusterCommand] (DefaultQuartzScheduler_Worker-1) [34e89140] CanDoAction of action ChangeVMCluster failed for user null@N/A. Reasons: VAR__ACTION__UPDATE,VAR__TYPE__VM__CLUSTER,VM_CLUSTER_IS_NOT_VALID
2015-05-18 13:06:45,995 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (ajp-/127.0.0.1:8702-11) [1105a1f] Correlation ID: 1105a1f, Call Stack: null, Custom Event ID: -1, Message: Failed to log User null@N/A out.