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Why do I get error message “Login failed for user (null). Reason: Not associated with a trusted SQL Server connection”?

April 26, 2017associated Error failed LOGIN message SQL Server trusted user

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Why do I get error message “Login failed for user (null). Reason: Not associated with a trusted SQL Server connection”?

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This error usually indicates that SQLServer (or MSDE) is configured to use Windows Authentication. If you want to use a SQL login, you will need to enable SQL Authentication (mixed mode authentication).