Our hosted ArcGIS Enterprise 10.6 system started showing errors after a Windows Server 2016 update. There are validation errors against Managed Database, Spatiotemporal and Tile Cache as shown in below picture:

In the Logs tab, I notice following two messages:
SEVERE | Mar 29, 2020, 6:29:26 PM | The connection property set was missing a required property or the property value was unrecognized. Instance not available on server | DataValidator.GPServer |
WARNING | Mar 29, 2020, 6:29:14 PM | Failed to validate the data store machine 'URL'. 'Server machine 'URL' returned an error. 'Invalid Token.'' | Admin |
Appreciate if someone could direct me in the right direction. Thanks
Farakh