"Localhost" as server name is may good for web server, but not for SQL Server.
Enter the realy server name.
This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
This our production server i setup the server in single user mode and creating sa account using sql query in cmd mentioned above image but facing mentioned issue, But in test server i am able to create sa account using above sql command,
"Localhost" as server name is may good for web server, but not for SQL Server.
Enter the realy server name.