如何连接Laravel和Microsoft sql server

Question

这是我在laravel中的配置：

'default' => env('DB_CONNECTION', 'sqlsrv'),
'sqlsrv' => [
            'driver'   => 'sqlsrv',
            'host'     => env('DB_HOST', '192.168.1.15'),
            'database' => env('DB_DATABASE', 'gaspos'),
            'username' => env('DB_USERNAME', 'vlado'),
            'password' => env('DB_PASSWORD', 'test1'),
            'charset'  => 'utf8',
            'prefix'   => '',
        ],

当我尝试时：

php artisan migrate，我得到：

  [PDOException]
  SQLSTATE[08001]: [Microsoft][ODBC Driver 11 for SQL Server]Named Pipes Prov
  ider: Could not open a connection to SQL Server [2].

任何人都知道什么是porblem？