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Yesterday, a developer has reported error Login failed for user ‘username’. (Microsoft SQL Server, Error: 18456) on one of the SQL Server instance that are running in lower life cycle. The details about error 18456 are given below with the screenshot.Cannot Connect to ‘SERVERNAME’.Login failed for user ‘username’.
This could be a pretty good answer if you could put the focus on the possibility of a missing SQL Server Login to Database User relationship or the possibility that the SQL Server Login's default database is no longer available. Currently your answer is just a generalised recommendation on how to create an account.
(Microsoft SQL Server, Error: 18456)Login failed Error 18456Initially, I thought login failed error 18456 was reported because user might have entered wrong password, but when I tried it with correct password, it displayed same error again. Read this article to fix this error.When I received same error after entering correct login id and password then we have decided to check the server authentication mode configured for this instance.
Here we got the answer because this SQL Server instance was configured to run in only Windows Authentication mode, that is why SQL Server database engine was not allowing us to login using SQL Server login that comes in to Mixed authentication mode. Right click on SQL Server Instance name in SSMS and choose properties. Select Security from left side pane. You can see Server Authentication mode is set to Windows Authentication mode in below screenshot. Change this to SQL Server and Windows Authentication mode that is second option in above screenshot and click on OK button. Restart SQL Server and SQL Server Agent services to apply the changes to database engine. Now you would be able to login to your SQL Server Instance using SQL logins as well.Related Articles.I hope you like this article.
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The error – SQL Server error 18456 login failed for user sa may occur because of different reasons. The first step to get it resolve is to check the SQL Server error log. I tried to replicate the error. The error occurs when you try to login to SQL Serve with SQL Server login.
A snapshot from error is shown below.The first step is to review the SQL Server error log. A snapshot from error log is shown below.The error log says that the SQL Server is configured for Windows Authentication. The solution is to configure SQL Server to allow Windows and SQL Server authentication mode.To do this, right click on server node in object explorer Properties Security Pane Server Authentication Section select SQL Server and Windows Authentication mode as shown below.