错误2003(HY000):无法连接到MySQL服务器(111)

问题描述

此问题与以下问题有关:

This question is related to the following questions:

• 无法连接到MySQL服务器错误111
• 尝试连接到远程MySQL主机(错误2003)

• Can't connect to MySQL server error 111
• Trying to connect to remote MySQL host (error 2003)

我正在本地计算机上配置新的MySQL(5.1)服务器.我需要提供对数据库的远程访问.我执行了以下步骤:

I am configuring a new MySQL (5.1) server on my local machine. I need to provide remote access to the database. I did the following steps:

1. 在my.cnf中的注释bind-address:

# bind-address      = 192.168.1.3

授予特权:

Grant privileges:

GRANT ALL PRIVILEGES ON *.* TO 'nickruiz'@'%' IDENTIFIED BY PASSWORD 'xxxx';

设置路由器上的端口转发(TCP和UDP，端口3306、192.168.1.3)

为防火墙配置iptables

Set port forwarding on router (TCP and UDP, port 3306, 192.168.1.3)

Configure iptables for firewall

sudo iptables -I INPUT -p udp --dport 3306 -j ACCEPT

sudo iptables -I INPUT -p tcp --dport 3306 --syn -j ACCEPT

sudo iptables-save

重新启动mysql服务器sudo /etc/init.d/mysql restart

测试时，我得到以下信息:

When testing, I get the following:

局域网:

mysql -h 192.168.1.3 -u nickruiz -p
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 95
Server version: 5.1.63-0ubuntu0.11.04.1 (Ubuntu)

远程

mysql -h 1xx.xx.4.136 -u nickruiz -p
ERROR 2003 (HY000): Can't connect to MySQL server on '1xx.xx.4.136' (111)

很明显，出了点问题，这使我无法使用我的全局IP地址.

Clearly there's something wrong that's preventing me from being able to use my global IP address.

注意:

• 我尝试在同一台机器上测试远程连接，并且通过SSH从远程计算机.
• 我不确定我的ISP是否给我提供了静态IP.

• I've tried testing the remote connection on the same machine and alsovia SSH from a remote machine.
• I'm not sure if my ISP has given me a static IP.

有什么想法吗?

更新:telnet似乎无法正常工作.

Update:telnet doesn't seem to be working.

telnet 192.168.1.3 3306
Trying 192.168.1.3...
Connected to 192.168.1.3.
Escape character is '^]'.
E
5.1.63-0ubuntu0.11.04.1,0g8!:@pX;]DyY0#\)SIConnection closed by foreign host.

推荐答案

请使用:

netstat -nat |grep :3306

如果显示

 tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN

没关系，您可以进行远程连接.

Thats is ok for your remote connection.

但是在这种情况下，我认为您有

But in this case i think you have

tcp        0     192.168.1.3:3306            0.0.0.0:*               LISTEN

那对您的远程连接是可以的.您还应该检查防火墙(如果为centos/redhat，则为iptables)

Thats is ok for your remote connection.You should also check your firewall (iptables if you centos/redhat)

services iptables stop

用于测试或使用:

iptables -A input -p tcp -i eth0 --dport 3306 -m state NEW,ESTABLISHED -j ACCEPT
iptables -A output -p tcp -i eth0 --sport 3306 -m state NEW,ESTABLISHED -j ACCEPT

还有另一件事要检查您对远程连接的授予权限:

And another thing to check your grant permission for remote connection :

GRANT ALL ON *.* TO remoteUser@'remoteIpadress' IDENTIFIED BY 'my_password';

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