After Installing Civil 3D 2018, it would not let me validate my license and kept giving me an error that I was not connected to the internet even when I was. The errors after installing Civil 3D 2018 "You must go Online to connect" "Network License Manager not Functioning or was not installed correctly"
THE SOLUTION: Open your Autodesk Desktop App, and at the top right SIGN OUT! Then open Civil 3D again and it will ask you to login with your Autodesk ID and it should finally connect to the internet and get a license or 30 day trial.
