Unable to login to SQL Server + SQL Server Authentication + Error: 18456

Question

I have created login account on my localhost\\sql2008 Server (Eg. User123)

Mapped to Database (default)

Authentication Mode on SQL Server is set to both (Win

Answer 1

You can access this by

Right click on instance (IE SQLServer2008)
Select "Properties"
Select "Security" option
Change "Server authentication" to "SQL Server and Windows Authentication mode"
Restart the SQLServer service
    Right click on instance
    Click "Restart"

Just for anyone else reading this: This worked for me on 2012 SQL Server too. Thanks