MySQL cannot be accessed. Navicat prompt: is not allowed to connect to this MySQL server

Mysql cannot access ,navicat Tips ：is not allowed to connect to this MySQL server

  resolvent ：

mysql> use mysql;

mysql> update user set host = '%' where user = 'root';

mysql> FLUSH PRIVILEGES;

>SELECT DISTINCT CONCAT('User: ''',user,'''@''',host,''';') AS query FROM mysql.user;

 

  Connect again successfully .