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https://blog.sqlauthority.com/2008/11/04/sql-server-fix-error-4064-cannot-open-user-default-database-login-failed-login-failed-for-user/
https://stackoverflow.com/questions/10010062/error-in-login-to-sql-server
https://www.sqlservercentral.com/Forums/Topic890300-146-1.aspx
https://www.mytechmantra.com/LearnSQLServer/Fix-cannot-open-user-default-database-Login-failed-Login-failed-for-user-SQL-Server-Error/
https://support.microsoft.com/en-us/help/307864/error-message-when-you-connect-to-an-instance-of-sql-server-cannot-ope
https://social.technet.microsoft.com/Forums/sharepoint/en-US/1c0bf65b-088e-4034-8a7f-f09a912320b5/login-failed-for-user-microsoft-sql-server-error-4064?forum=sharepointadminlegacy
https://support.microsoft.com/de-de/help/307864/error-message-when-you-connect-to-an-instance-of-sql-server-cannot-ope
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/a0b94a66-37cc-4bc7-9e05-cce78fb002f4/cannot-open-open-user-default-database-login-failed-for-user-username?forum=sqldataaccess
https://www.sqlrecoverysoftware.net/blog/sql-error-4064.html
https://www.stellarinfo.com/blog/sql-database-error-cannot-open-user-default-database/
https://techyaz.com/sql-server/troubleshooting/fix-error-4064-cannot-open-user-default-database-login-failed/
https://www.sqlmvp.org/resolve-sql-error-4064/
https://www.systoolsgroup.com/updates/resolve-cannot-open-user-default-database-login-failed-error/