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https://docs.microsoft.com/ru-ru/sql/relational-databases/errors-events/mssqlserver-18456-database-engine-error
https://support.microsoft.com/ru-ru/help/555332/login-failed-for-user-error-message-when-you-log-on-to-sql-server
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/e1082cad-9248-44ed-bfcc-c08d7cc08831/login-failed-for-user-sa-microsoft-sql-server-error-18456-severity-14-state-1-when-i-use?forum=sqldatabaseengine
https://wiki.merionet.ru/servernye-resheniya/12/reshaem-error-18456-v-sql/
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://stackoverflow.com/questions/20923015/login-to-microsoft-sql-server-error-18456
http://www.sql.ru/forum/772027/sql-error-18456
http://www.sql.ru/forum/125536/oshibka-merge-agent-18456-login-failed-for-user-sa
https://theitbros.com/microsoft-sql-server-error-18456/
http://www.data-recovery-solutions.com/blog/login-failed-for-user-microsoft-sql-server-error-18456/
https://www.liquidweb.com/kb/troubleshooting-microsoft-sql-server-error-18456-login-failed-user/
https://www.sqlservergeeks.com/sql-server-error-18456-login-failed-for-user-sa/
https://www.eukhost.com/forums/forum/technical-support/tutorials-how-tos/12628-login-failed-for-user-sa-microsoft-sql-server-error-18456