Article ID: 555332 - View products that this article applies to.
Author: Yuval Sinay MVP
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After you install Microsoft SQL Server 2012, SQL Server 2008, SQL Server 2005, or SQL Server 2000 and you try to connect to the server that is running SQL Server, you receive one of the following error messages:
This problem occurs if the user tries to log in with credentials that cannot be validated. This problem can occur in the following scenarios:
To resolve this problem, follow the steps that apply to your scenario.
Scenario 1: Configure SQL Server in Mixed Authentication Mode.
SQL Server 2012, SQL Server 2008, and SQL Server 2005
SQL Server 2000
Scenario 2: Verify that the SQL Server login existsIf you are trying to connect to the SQL Server by using SQL Server Authentication, and the server is configured for mixed mode authentication, verify that the SQL Server login exists. For more information, see Create a login
(http://technet.microsoft.com/en-us/library/ms144284.aspx)in SQL Server Books Online.
Scenario 3: The login may use Windows Authentication but the login is an unrecognized Windows principal.If you are trying to connect to SQL Server by using Windows Authentication, verify that you are logged in to the correct domain.
Article ID: 555332 - Last Review: July 12, 2013 - Revision: 4.1
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