Connection Status displays “Not connected” or is empty

An OnGuard version 4.0 access control instance added into XProtect displays a Connection Status  in the Access Control Information window  as "Not connected" or no information is displayed. 

This is an indication that a non-critical error has happened with the ACMServer. The process of retrieving the current state of the system failed. Verify that the other functions of the integration are still working by clicking the Doors and Associated Cameras menu or any other active menu for this instance. If functionality is still working in these menus, proceed to verify that Smart Client functionality:  access control monitors, map icon status, and access control workplace search are still available.