MySQL remote connection [not as usual]

Question

I\'m not getting to get access to mysql externally. I think it\'s mysql or firewall stuff or some privilege within the mysql.

I already tried doing steps that are on int

Answer 1

Resumed solution:

I killed the mysqld that was holding the 3306 port and restarted it.

I think this is a bug or something related check step-by-step what I did:

1- Created a program to connect on 3306

First I create a simple program in Java to make sure there wasn't any problem with my firewall. The program just open a port on 3306 with TCP connection by 2 minutes just for testing, the program:

import java.io.IOException;
import java.net.ServerSocket;

public class PortMysqlTest {
    public static void main(String[] args) {
        int port = 3306;

        ServerSocket ss = null;
        try
        {
            ss = new ServerSocket(port);
            ss.setReuseAddress(true);
        }
        catch (IOException e)
        {
            System.out.println(e.getMessage());
        }

        long futureTime = System.currentTimeMillis() + 1000 * 60 * 2;
        while (System.currentTimeMillis() < futureTime)
        {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        if (ss != null)
        {
            try
            {
                ss.close();
            }
            catch (IOException e)
            {
                System.out.println(e.getMessage());
            }
        }       
    }

2- Stopped the mysql service

Before executing the program I stopped the mysql service:

sudo service mysql stop

or it can be done with:

/etc/init.d/mysql stop

3- Started My program with java PortMysqlTest

My program (PortMysqlTest) throw an exception saying the address/port as already in use by mysqld!

Surprise? As far as I know the with mysql service stopped the port should be free. Am I right? (I'm not sure of it if someone can answer this...)

4- I searched for the application PID that was using the address/port with:

sudo netstat -lpn | grep 3306

the answer:

tcp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN      6736/mysqld

5- I killed the process with:

kill -9 6736

OBS, if you don't know what kill do: 6736 is the process that was holding the port, I got this number with step 4, 6736/mysqld

6- Now I run my program again:

java PortMysqlTest and connected with telnet (telnet 66.123.173.170 3306) externaly and it worked!

So the problem wasn't the firewall, because I could connect externally to the machine 66.123.173.170.

7- Started the mysql service again:

(I waited 2 minutes for my program do stop and free the 3306 port) and started the mysql service again to test, with:

sudo service mysql start 

or

sudo /etc/init.d/mysql start

8- I did connected externally with telnet:

telnet 66.123.173.170 3306

and worked!!!

After I tried connect to mysql with:

mysql -h 66.123.173.170 -u root -p 

and worked!!!

Conclusion: I think there was a bug with my MySql installation; or something, (I don't know what is), when restarting mysql the mysql doesn't get the configuration of:

bind-address = 0.0.0.0 

or

bind-address = * 

I hope this help someone else.