Linux安装完mysql之后，用Navicat工具连接报错：
1130-host '' is not allowed to connect to this MySql server
解决方法：
可能是你的帐号不允许从远程登陆，只能在localhost。这个时候只要在localhost的那台电脑，登入mysql后，更改 "mysql" 数据库里的 "user" 表里的 "host" 项，从"localhost"改称"%"
[root@localhost ~]# mysql -u root -p
mysql>use mysql;
mysql>update user set host = '%' where user = 'root' and host = 'localhost';
Query OK, 0 rows affected (0.00 sec)
Rows matched: 0 Changed: 0 Warnings: 0
mysql>select host, user from user;
+-----------------------+------+
| host | user |
+-----------------------+------+
| % | |
| % | root |
| 127.0.0.1 | root |
| ::1 | root |
| localhost.localdomain | |
| localhost.localdomain | root |
+-----------------------+------+
6 rows in set (0.00 sec)
OK，解决。
其他方法待验证。