Node.js MySQL – Error: connect ECONNREFUSED

I use Node.js server side. I tried my code on localhost and everything works fine. I bought a server and installed Apache and node.js on it and test my web application there. I correctly changed the MySQL connection configurations from localhost to the server configurations.

I test my web application with this configuration:

var mysql      = require('mysql');
var mysqlConnection;
function new_mysqlConnection() {
    mysqlConnection = mysql.createConnection({
      host     : 'myurl.at',
      user     : 'myusername',
      database : 'mydatabase',
      password : 'mypassword'
    });
}

I start the node.js server with:

$ node server.js

When I load the page, it’s correctly displayed, but when Node.js try to connect to the database I always got the following error:

Error: connect ECONNREFUSED
    at errnoException (net.js:905:11)
    at Object.afterConnect [as oncomplete] (net.js:896:19)
    --------------------
    at Protocol._enqueue (/var/www/node_modules/mysql/lib/protocol/Protocol.js:135:48)
    at Protocol.handshake (/var/www/node_modules/mysql/lib/protocol/Protocol.js:52:41)
    at Connection.connect (/var/www/node_modules/mysql/lib/Connection.js:119:18)
    at reconnectDb (/var/www/server.js:319:18)
    at app.get.email (/var/www/server.js:109:2)
    at Layer.handle [as handle_request] (/var/www/node_modules/express/lib/router/layer.js:82:5)
    at trim_prefix (/var/www/node_modules/express/lib/router/index.js:302:13)
    at /var/www/node_modules/express/lib/router/index.js:270:7
    at Function.proto.process_params (/var/www/node_modules/express/lib/router/index.js:321:12)
    at next (/var/www/node_modules/express/lib/router/index.js:261:

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