ConnectionError: Failed to connect in mssql in nodeJS

i'm trying to connect to my database using MSSQL Server using NodeJS

but i have an error

{ ConnectionError: Failed to connect to 10.10.17.199:undefined in 15000ms

here is the beginning of my code:

   var sql = require("mssql");

    // config for your database
    var config = {
        user: 'mat1',
        password: 'a',
        server: '10.10.17.199\\MSSQLLocalDB', 
        database: 'master' ,
        port: 1433
    };

    //\\MSSQLLocalDB

    console.log("passed 1")

    // connect to your database
    sql.connect(config, function (err) {

        if (err) console.log(err);

        // create Request object
        var request = new sql.Request();

what's wrong ?

via Testtestt3