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https://blog.sqlauthority.com/2016/09/08/sql-server-fix-error-18456-severity-14-state-5-login-failed-user/
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/e2d819ed-49dd-4e18-87f1-05a6dc86a8c6/error-18456-severity-14-state-5?forum=sqldatabaseengine
https://blogs.technet.microsoft.com/leesteve/2017/05/23/troubleshooting-sql-error-18456-severity-14-state-5/
https://dba.stackexchange.com/questions/37564/login-failed-for-user-error-18456-severity-14-state-11
http://sql-articles.com/articles/troubleshooting/troubleshooting-login-failed-error-18456/
https://stackoverflow.com/questions/47372102/login-failed-for-user-xyz-error-18456-severity-14-state-5
https://www.sqlservercentral.com/Forums/Topic1303541-391-1.aspx
https://forums.asp.net/t/1411175.aspx?Login+failed+for+user+XYZ+Error+18456+Severity+14+State+5
https://support.arcserve.com/s/article/207112206?nocache=https%3A%2F%2Fsupport.arcserve.com%2Fs%2Farticle%2F207112206%3Flanguage%3Den_US
https://logicalread.com/errors-sql-server-login-failures-pd01/
http://www.data-recovery-solutions.com/blog/login-failed-for-user-microsoft-sql-server-error-18456/
https://www.sqlserver-dba.com/2013/03/error-18456-state-5-.html
https://www.reddit.com/r/SQL/comments/45x4n5/error_18456_severity_14_state_5_login_failed_for/