If you are getting Microsoft SQL Server Error 18456 Login Failed for User sa error to connect with system admin (SA) Login.
![sa]( "sa")
Then you can apply below step to resolve this issue
Go to SQL Server Properties - Security - Server Authentication section- check Sql Server and Windows authentication mode
![Mixed mode]( "Mixed mode")
Then you can apply below step to resolve this issue
Go to SQL Server Properties - Security - Server Authentication section- check Sql Server and Windows authentication mode
After that restart SQL server services then it will work fine.
