Show how to troubleshoot SQL Server “Login failed for user sa” error.
Dear SQL Server users!
Have you ever encountered the situation where you connected to SQL Server but were stopped by the error message saying “Login failed for user ‘sa’. (Microsoft SQL Server, Error: 18456)”? This is a common SQL Server login error. Then how to troubleshoot SQL Server sa user login failed errors?
From here you can find all causes and solutions for SQL Server login failed for user depending on different error messages.
Normally, the possible cause for “error 18456” is incorrect sa password you entered. This video explains how to troubleshoot the login failed error.
Nguồn: alluwant.life
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There is one more solution available: http://www.sqlrecoverysoftware.net/blog/sql-login-error-18546.html