No process is on the other end of the pipe (SQL Server 2012)
The server was set to Windows Authentication only by default. There isn't any notification, that the origin of the errors is that, so it's hard to figure it out. The SQL Management studio dont alert, even if you create a user with SQL Authentication only.
So the answer is: Switch from Windows to SQL Authentication:
- Right click on the server name and select
properties; - Select
securitytab; - Enable the
SQL Server and Windows Authentication mode; - Restart the SQL Server service.
You can now connect with your login/password.
Here are the directions by Microsoft: https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/change-server-authentication-mode?view=sql-server-ver15
To solve this, connect to SQL Management Studio using Windows Authentication, then right-click on server node Properties->Security and enable SQL Server and Windows Authentication mode. If you're using 'sa' make sure the account is enabled. To do this open 'sa' under Logins and view Status.
If this didn't work, you may need to reinstall SQL Server
