Why Am I Getting a \"connect ECONNREFUSED\" Error When Connecting to MySQL from My Node.js Application?

Node.js MySQL Connection Error: ECONNREFUSED

While troubleshooting a Node.js application deployed to a remote server, you may encounter a "connect ECONNREFUSED" error when attempting to connect to a MySQL database. This issue can arise despite ensuring correct MySQL connection configurations.

The error typically indicates that the MySQL server on the remote host is not listening on the default port or is not accessible from the Node.js application due to firewall or network restrictions.

One possible solution is to verify that the host configuration in the connection string is correct. The "localhost" value should be replaced with the actual IP address or hostname of the remote server where MySQL is running.

Here's how to update the host configuration in the code provided:

<code class="javascript">var mysql      = require('mysql');
var mysqlConnection;
function new_mysqlConnection() {
    mysqlConnection = mysql.createConnection({
      host     : '127.0.0.1', // Replace 'localhost' with the IP address or hostname of the remote server
      user     : 'myusername',
      database : 'mydatabase',
      password : 'mypassword'
    });
}</code>

Ensure that the firewall or network configuration on the remote host allows connections from the Node.js application on the expected port (usually port 3306 for MySQL).

After making these updates, restart the Node.js server to test if the connection issue has been resolved. If the problem persists, further investigation may be necessary, such as checking the MySQL server logs or network connectivity between the Node.js application and the database server.

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