برطرف نمودن خطای Not associated with a trusted SQL Server connection

مراحل زیر را انجام دید :

1. Start Enterprise Manager.
2. Expand Microsoft SQL Servers, and then expand SQL Server Group.
3. Right-click the server that you want to change to SQL Server and Windows authentication, and then click
   Properties.
4. In the SQL Server Properties dialog box, click the Security tab, click SQL Server and Windows, and then click OK.
5. When you are prompted to re-start the SQL Server service, click Yes.

مرجع :

https://support.microsoft.com/en-us/help/889615/you-may-receive-a-not-associated-with-a-trusted-sql-server-connection