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https://blogs.msdn.microsoft.com/sql_protocols/2007/06/30/login-failed-for-user-xx-msg-18456-level-14-state-1/
https://docs.microsoft.com/pt-br/sql/relational-databases/errors-events/mssqlserver-18456-database-engine-error
https://social.msdn.microsoft.com/Forums/en-US/18bc7aac-c7e0-4d51-aad4-73faa7e3388f/msg-18456-level-14-state-1-line-1-login-failed-for-user?forum=sqlsecurity
https://stackoverflow.com/questions/2474839/unable-to-login-to-sql-server-sql-server-authentication-error-18456
https://www.experts-exchange.com/questions/25966850/sqlcmd-not-connecting-Msg-18456.html
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://www.sqlservercentral.com/Forums/FindPost548200.aspx
https://dba.stackexchange.com/questions/7111/local-login-impersonation-not-working-with-a-linked-server
http://mssqllover.blogspot.com/2015/09/how-to-fix-ms-sql-server-error-18456.html
http://www.oostdam.info/index.php/knowledge-faqs/17-sql-errors-and-how-to/138-sql-error-18456-login-failed
https://www.sqlteam.com/forums/topic.asp?TOPIC_ID=150876
https://www.mssqltips.com/sqlservertip/2679/sql-server-login-failure-error-18456-severity-14-state-10/