当我尝试使用命令行mysql -h <remote-ip> -u any_existing_users -p或任何其他mysql客户端（例如phpmyadmin）连接远程MySQL服务器时，它不起作用，并且错误提示为

ERROR 2003 (HY000) Can't connect to MySQL server on '<remote-ip>' (61)

但是，当我尝试ssh <remote-ip>通过本地连接MySQL时mysql -u root -p，没有问题。

这是用户表（SELECT User, Host FROM mysql.user;）的一部分：

+------------------+----------------+
| User             | Host           |
+------------------+----------------+
| root             | %              |
| other_users      | <remote-ip>    |
| root             | localhost      |
+------------------+----------------+

这是iptable：

Chain INPUT (policy ACCEPT)
num  target     prot opt source               destination         
1    RH-Firewall-1-INPUT  all  --  0.0.0.0/0            0.0.0.0/0

Chain FORWARD (policy ACCEPT)
num  target     prot opt source               destination         
1    RH-Firewall-1-INPUT  all  --  0.0.0.0/0            0.0.0.0/0

Chain OUTPUT (policy ACCEPT)
num  target     prot opt source               destination

Chain RH-Firewall-1-INPUT (2 references)
num  target     prot opt source               destination         
1    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           
2    ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0           icmp type 255 
3    ACCEPT     esp  --  0.0.0.0/0            0.0.0.0/0           
4    ACCEPT     ah   --  0.0.0.0/0            0.0.0.0/0           
5    ACCEPT     udp  --  0.0.0.0/0            224.0.0.251         udp dpt:5353 
6    ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0           udp dpt:631 
7    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:631 
8    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED 
9    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:22 
10   REJECT     all  --  0.0.0.0/0            0.0.0.0/0           reject-with icmp-host-prohibited 
11   ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:3306

所以有什么问题？