Occurs if connection to Enterprise Controller is lost for whatever reason (network issue or EC is down). In this case, the connection icon in the top right corner becomes red () and Notification is displayed.
If User clicks on the notification, then login dialog will automatically open. See "Connecting to Enterprise Controller and Working Offline".
This notification will hide automatically as soon as the connection is restored.
Why Event may work incorrectly
Notifications on this type of Event is hidden in system settings. See "Notifications" for more details.