JavaScript Node.js application crashes with mysql node application crashes,heroku app crashed node

I am using node.js for an application, I'm also using mysql to allow users to connect on the app.

I was using the application on local, and it was working pretty well, no crash, nothing bad.

Today I tried to put the js server on my dedicate server and the client on my web server.

Now that it is uploaded, I try to launch the server, but it crashes after a few seconds with these tracebacks :

events.js:48

    throw arguments[1]; // Unhandled 'error' event

Error: Connection lost: The server closed the connection.
    at Protocol.end (/root/node_modules/mysql/lib/protocol/Protocol.js:73:13)
    at Socket.onend (stream.js:80:10)
    at Socket.emit (events.js:88:20)
    at TCP.onread (net.js:388:51)

The connection code is simple :

var mysql = require('mysql');
var connection = mysql.createConnection({
    host : 'hostname',
    user : 'username',
    password : 'password',
    database : 'database',
});
connection.connect();

I tried to add a column into my db just after the connection and it works fine, my database which is on a different server than the js server accepts the connection and adds the column.

I don't know why I don't have these errors while I'm working on local...

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