SQL Server Login Failed for user

Very often we will get the error message “Login failed for user ‘’”. Sometime we may forget what settings we have given while installing SQL Server. In case, if you choose only “Windows Authentication” while installing then you can’t able to connect a user which related with SQL Server authentication.
How to solve this problem?
It is very easy to solve this issue. Right click on the server and go to properties.
Then in properties, go to security tab and change the server authentication to “SQL Server and Windows Authentication mode” and click ok.
Now try with SQL Server authentication login, you will get success.
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