[sql-server] No process is on the other end of the pipe (SQL Server 2012)

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.

enable sa admin

If this didn't work, you may need to reinstall SQL Server