i can't connect with database engine using both authentication (windows authentication and sql server Authentication) in sql server 2014. i get same error for both authentication. please give me some solution for these error...
Have you installed Database engine? Just verify this. Go to "SQL Server 2014 Configuration Manager" and check if you can see the server NAV1\NAVDEMO1. If yes probably you need to restart the service.
Harikiran BM, Dynamics NAV Technical Consultant