You solve this in SQL Server Management Studio for the database that you are connecting to. Open SSMS, right-click on the Server you are using and then click Properties. Go to "Security" and then switch the server to "SQL Server and Window Authentication Mode." Make sure you have your sa password set, and use that password when logging in via GP (generally through GP Utilities). The problem originates with SQL Server not allowing GP to connect to it, since it doesn't use Windows Authentication. Hope this helps.
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