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https://support.microsoft.com/hi-in/help/555332/login-failed-for-user-error-message-when-you-log-on-to-sql-server
https://stackoverflow.com/questions/17372606/sqlserver-login-failed-for-user
http://itproguru.com/expert/2014/09/how-to-fix-login-failed-for-user-microsoft-sql-server-error-18456-step-by-step-add-sql-administrator-to-sql-management-studio/
https://channel9.msdn.com/Blogs/raw-tech/How-To-Fix-Login-Failed-for-User-Microsoft-SQL-Server-Error-18456-Step-By-Step
https://comm.support.ca.com/kb/datamaker-sql-server-error-18456-login-failed-for-user/kb000009197
https://support.plesk.com/hc/en-us/articles/360004061693-MSSQL-sa-user-keeps-getting-locked-Login-failed-for-user-sa-
https://www.jprog.com/wiki/Receiving-error-Login-failed-for-user-cwbt.ashx
https://bqekb.zendesk.com/hc/en-us/articles/360012713932-Login-failed-for-user
https://blog.sqlauthority.com/2014/01/17/sql-server-fix-login-failed-for-user-username-the-user-is-not-associated-with-a-trusted-sql-server-connection-microsoft-sql-server-error-18452/
https://support.solarwinds.com/Success_Center/Server_Application_Monitor_(SAM)/Knowledgebase_Articles/SQL_Event_log_error_Login_failed_for_user_Domain_Username
http://support.pitneybowes.com/VFP06_KnowledgeWithSidebarTroubleshoot?id=kA280000000CoakCAC&popup=false&lang=en_US
http://lexisnexis.custhelp.com/app/answers/answer_view/a_id/1086831/~/error%3A-login-failed-for-user-sa.-the-user-is-not-associated-with-a-trusted
https://www.sqlserverlogexplorer.com/fix-microsoft-sql-server-login-failed-error-18456/