情况：MariaDB设置了TCP/IP的端口，但是还是无法进行远程访问。
解决方法：
一、使用ssh登录群晖，并进入MariaDB安装目录
cd /volume1/@appstore/MariaDB10/usr/local/mariadb10/bin
二、使用root登录 MariaDB，然后进行修改
mysql -u root -p
MariaDB [(none)]> use mysql
Database changed
MariaDB [mysql]> update user set host = '%' where user = 'root';
ERROR 1062 (23000): Duplicate entry '%-root' for key 'PRIMARY'
MariaDB [mysql]> select host,user from user;
+-----------+------+
| host | user |
+-----------+------+
| % | root |
| 127.0.0.1 | root |
| ::1 | root |
+-----------+------+
3 rows in set (0.001 sec)
MariaDB [mysql]> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.002 sec)
MariaDB [mysql]>