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My project's backend is SQL Server 2005 and I need to install this to customers' systems.

The problem is when someone logs onto the computer, they can easily access the SQL Server with Windows authentication. How can I protect the SQL server from local logins?

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up vote 4 down vote accepted

It's not possible to stop Windows local admins from accessing SQL server - see

By default, users who are not local admins will not be able access SQL Server with Windows Authentication. So the solution for you is to ensure your users are not local admins.

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