During installation, SQL Server Database Engine is set to either Windows Authentication mode or SQL Server and Windows Authentication mode. After installation, you can change the authentication mode at any time. If Windows Authentication mode is selected during installation, the sa login is disabled and a password is assigned by setup. POSitive software will not work if the Mixed Mode Authentication was not selected during the SQL Server installation process (see Step 4: Database Engine Configuration of the How to Install SQL Server 2014 Express knowledgebase article: http://kb.gopositive.com/installsqlserverexpress).
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In the link to the following Microsoft article you will be presented with instructions describing how to change the server authentication mode in SQL Server by using SQL Server Management Studio or Transact-SQL. We recommend using the SQL Server Management Studio method.
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