In Insights for ArcGIS 1.1, new database connections cannot be made in a workbook if administrative access is disabled in the ArcGIS GIS Server web adaptor
The Admin URL used in federation with Portal for ArcGIS must have a trusted signed certificate
解决办法
Turn on administrative access to the ArcGIS GIS Server web adaptor, close the browser tab with Insights for ArcGIS and reopen it from the Portal for ArcGIS home endpoint.