6、重新启动服务器
虽然网上好多文章都说只需要重新启动SQL服务就可以，但是经过验证，必须重新启动机器才行
In order to get things to work. You might need to completely reboot the server machine after making the changes. There have been reports (thanks P.C.) that starting and stopping the SQL Server and Browser software is not enough.
7、使用SQL Server Configuration Manager 测试 注意 ： Server Name 一定要 SereverSQLEXPRESS
同时还要在 Options -> Network protocol 中选择TCP/IP才能顺利登录