解决MySQL Error (2013): Lost connection to MySQL server at 'reading initial communication packet',system error:0

未授权的原因，解决：

mysql数据库中增加一条记录
insert into user (host,user,password) values('%','admin','123456');


添加授权
GRANT ALL PRIVILEGES ON *.* TO 'admin'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;

刷新，使授权生效。
flush privileges;