Trying to connect live sql server with node js

Question

I'm trying to connect my SQL server with node js but I'm getting the following error.

Error: connect ECONNREFUSED 172.24.68.210:3306 Error no: -4078

var mysqlConnection = mysql.createConnection({
    host : 'hostname',
    user : 'username',
    password: 'pass',
    database: 'db', 
});