Simon Steed's Blog About Stuff! » login failed for user null the user is not associated with a trusted sql server connection http://blog.xploiter.com i.e. anything interesting... Wed, 01 Sep 2010 11:15:48 +0000 en hourly 1 http://wordpress.org/?v=8679 SQL SERVER – Fix : Error: 18452 Login failed for user ‘(null)’. The user is not associated with a trusted SQL Server connection. http://blog.xploiter.com/general-stuff/sql-server-fix-error-18452-login-failed-for-user-%e2%80%98null%e2%80%99-the-user-is-not-associated-with-a-trusted-sql-server-connection/ http://blog.xploiter.com/general-stuff/sql-server-fix-error-18452-login-failed-for-user-%e2%80%98null%e2%80%99-the-user-is-not-associated-with-a-trusted-sql-server-connection/#comments Tue, 07 Oct 2008 16:18:53 +0000 Simon Steed http://simonsteed.wordpress.com/2008/10/07/sql-server-fix-error-18452-login-failed-for-user-%e2%80%98null%e2%80%99-the-user-is-not-associated-with-a-trusted-sql-server-connection/ This one always catches me out, about time I logged it so I don’t need to googlise it everytime!

SQL SERVER – Fix : Error: 18452 Login failed for user ‘(null)’. The user is not associated with a trusted SQL Server connection.

April 14, 2007 by pinaldave

Some errors never got old. I have seen many new DBA or Developers struggling with this errors.

Error: 18452 Login failed for user ‘(null)’. The user is not associated with a trusted SQL Server connection.

Fix/Solution/Workaround:
Change the Authentication Mode of the SQL server from “Windows Authentication Mode (Windows Authentication)”
to “Mixed Mode (Windows Authentication and SQL Server Authentication)”.

Run following script in SQL Analyzer to change the authentication

ALTER LOGIN sa ENABLE
GO
ALTER LOGIN sa WITH PASSWORD = ”
GO

Taken from SQLAuthority.com

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