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https://social.msdn.microsoft.com/Forums/sqlserver/en-US/8eba01fd-7686-4564-bfae-cfe09d38b90b/login-failed-for-user-quotxyz-client-ltlocal-machinegt?forum=sqlexpress
http://www.eraofdata.com/sql-server/connectivity/sql-server-login-failures-18456-errors/
https://dba.stackexchange.com/questions/74061/sql-server-2012-cant-log-in-with-machine-account
https://www.mssqltips.com/sqlservertip/4941/find-all-failed-sql-server-logins/
http://sql-articles.com/articles/troubleshooting/troubleshooting-login-failed-error-18456/
https://serverfault.com/questions/2218/sql-server-issue-login-failed-for-user-username
https://wiki.scn.sap.com/wiki/display/SAPSQL/User+Login+Related+Issues
https://stackoverflow.com/questions/53525593/ms-sql-native-client-login-failed-for-user-when-connecting-via-php
https://stackoverflow.com/questions/24822076/sql-server-login-error-login-failed-for-user-nt-authority-system/24822077
http://support.pitneybowes.com/VFP06_KnowledgeWithSidebarTroubleshoot?id=kA280000000Cg3DCAS&popup=false&lang=en_US
https://thesqldude.com/tag/login-failed/
https://network.informatica.com/thread/78038
https://blog.sqlauthority.com/2015/08/19/sql-server-login-failed-for-user-reason-token-based-server-access-validation-failed-with-an-infrastructure-error/