Learn how to host a True Arc layer in a database and connect to it through the ArcGIS Enterprise Portal.
Prerequisites
It is recommended to connect by using port and database authentication.
The authorization file was created when ArcGIS Server was authorized (the keycode file exists where the ArcGIS Server is installed. It is typically found here: C:\Program Files\ESRI\LicenseXX.X\sysgen).
If the ArcGIS Enterprise Portal is setup, a SQL database server has been created and the layer is hosted in one of the database servers. The layer is published in ArcGIS Enterprise Portal and imported into Civil3D, but it cannot be saved back.
Make sure Apply Edits is listed in Supported Operations and Support True Curves is listed as true.