How to change SQL Server Authentication Mode?

SQL Server use two Authentication mode:

• Windows Authentication mode

- currently logged user in Operation System is used to connect to Server - if the user has permissions to do so.

• SQL Server and Windows Authentication mode

- we can use login that is defined in SQL Server.

We can change the a authentication mode via T-SQL and Managemement Studio .

1) T-SQL

Go to Properties of Instance and click on Security on the left panel. And now you can choose two types of Server Authentication.

2) Managemement Studio

- to change the Windows Authentication mode use this query below:

- to change the SQL Server and Windows Authentication mode use this:

After the change you have to restart SQL Server and SQL Server Agent!