Set MySQL remote connection root permissions

In the remote connection to MySQL should have encountered, the root user can not connect to the remote MySQL, only local connection, foreign refused to connect.
You need to establish a database account that allows remote logins so that you can operate the database remotely.
Here's how:
By default, the MySQL database system database MySQL system table user rights within users only provide localhost native login;
You need to change permissions to enable remote connection to the MySQL database.
This can be confirmed by the following methods:
Root#mysql-h localhost-uroot-p
Enter Password: ******
Welcome to the MySQL Monitor. Commands End With; or \g.
Your MySQL Connection ID is 4 to server Version:4.0.20a-debug
Type ' help ', ' or ' \h ' for help. Type ' \c ' to clear the buffer.
mysql> use MySQL; (This DB holds various configuration information for MySQL)
Database changed
Mysql> select Host,user from user; (View the user's permission condition)
Mysql> Select Host, user, password from user;
+-----------+------+-------------------------------------------+
| Host | user | password |
+-----------+------+-------------------------------------------+
| localhost | Root | *4acfe3202a5ff5cf467898fc58aab1d615029441 |
| 127.0.0.1 | Root | *4acfe3202a5ff5cf467898fc58aab1d615029441 |
|       localhost |                                            | |
+-----------+------+-------------------------------------------+
4 rows in Set (0.01 sec)
As you can see, you can only access it as a host of localhost.
Workaround:
Mysql> Grant All privileges on * * to ' root ' @ '% ' identified by ' 123456 ' with Grant option;
(% means all external machines, if a certain machine is specified, the% is changed to the corresponding machine name; ' root ' means the username to be used.)
mysql> flush Privileges; (Run this sentence to take effect, or restart MySQL)
Query OK, 0 rows affected (0.03 sec)
Check again:
Mysql> Select Host, user, password from user;
+-----------+------+-------------------------------------------+
| Host | user | password |
+-----------+------+-------------------------------------------+
| localhost | Root | *4acfe3202a5ff5cf467898fc58aab1d615029441 |
| 127.0.0.1 | Root | *4acfe3202a5ff5cf467898fc58aab1d615029441 |
|       localhost |                                            | |
| %          | Root | *4acfe3202a5ff5cf467898fc58aab1d615029441 |
+-----------+------+-------------------------------------------+
4 rows in Set (0.01 sec)
It can be seen that a new user has been added
Quit, try the effect ....
You are now ready to log in successfully.

Set MySQL remote connection root permissions