【问题】
连接报错：
An exception of type System.Data.SqlClient.SqlException was thrown.
Additional exception information: A network-related or instance-specific error occurred while establishing a connection to SQL Server.
The server was not found or was not accessible
【解决办法】
1、打开sqlserver服务管理器，开启TCP/IP连接
2、设置TCP/IP中属性的"IP ALL"的端口为1433
3、重启SQL服务就可以用127.0.0.1登录上了