SocketIO ERR_CONNECTION_REFUSED

Question

I am starting to use NodeJS and Socket.IO. I am trying to set up a basic example with a NodeJS http server and establish a Socket.IO connection to the server.

I am also using angular JS and basically what I want is that when a user presses a button then the connection to the server is established. However, when I try it I get this error

GET http://localhost/socket.io/?EIO=2&transport=polling&t=1404288173776-3 net::ERR_CONNECTION_REFUSED

Here is my code:

server.js

var http = require('http');
var server= http.createServer(handler);
var io = require('socket.io')(server);

server.listen(8080);

function handler(req, res) {
    res.writeHead(200);
    res.end('Hello Http');
}

io.on('connection', function (socket){
    socket.emit('news', { hello: 'world' });
    console.log('connected!');
});

app.js

var app = angular.module('testApp', ['ngRoute']);

app.controller('TestCtrl', function ($scope){

    $scope.msg= "";

    $scope.try = function (){

        $scope.msg= "ALO"

        var socket = io('http://localhost');

        socket.on('news', function (data) {
            console.log(data);
        });

    };

});

And on my test.html file:

<body ng-controller="TestCtrl">

    <h2>{{msg}}</h2>
    <button ng-click="try()">Try</button>

    <script src="../js/angular.min.js"></script>
    <script src="../js/angular-route.min.js"></script>
    <script src="../js/app.js"></script>

    <script src="../node_modules/socket.io/node_modules/socket.io-client/socket.io.js"></script>

<!-- <script src="/socket.io/socket.io.js"></script> -->

</body>

I think that the error might be something related to the path I use when including the socket.io.js I have tried also using directly localhost:8080 in the path because I read it could be a solution but that didn't work. So please, I appreciate any help given. Thanks!

I had also the same error. After this post I just cross checked the URL which I had given incorrect.Thanks. — Abhishek Kumar, Sep 11 '19 at 18:05

leon · Answer 1 · 2016-04-24T19:27:02.293

66

I faced exactly the same issue. I did not see the ERR_CONNECTION_REFUSED in socket.io@~0.9. The error surfaced after I upgraded socket.io to 1.3.

I solved it by simply removing the URL from the client side constructor:

Change

var socket = io('http://localhost');

To

var socket = io();

As the socket.io tutorial showed: http://socket.io/get-started/chat/

edited Apr 24 '16 at 19:27

answered Jun 22 '15 at 04:51

leon

1,012
9
11

2

Using the implicit URL fixed it for me as well, thanks! – Dan Bechard Sep 27 '15 at 15:33
Nice answer. Just complementing what the example says: "Notice that I’m not specifying any URL when I call io(), since it defaults to trying to connect to the host that serves the page." – Felipe Volpatto Jul 05 '16 at 23:38
7

What about using different port or not hosted on local? – Maihan Nijat Oct 25 '18 at 14:54

Ben Fortune · Answer 2 · 2014-07-02T08:32:00.440

16

If your server is listening on port 8080, you need to connect to that port.

var socket = io('http://localhost:8080');

And as you're using a relative path, the socket.io lib will be served fine.

<script src="/socket.io/socket.io.js"></script>

edited Jul 02 '14 at 08:32

answered Jul 02 '14 at 08:25

Ben Fortune

31,623
10
79
80

1

I tried these two solutions before (sorry I didn't mention that) but I get a file not found error for the socket.io.js path, that's why I tried the other one. I don't know what could be the problem. I installed socket.io using npm install socket.io and the node_modules folder containing socket io are in my users folder on windows for some reason and not in the node_modules folder that is in program files. Could that have something to do with the problem? I tried to install globally to see if it changed the location folder but it didn't :/ I don't know what else to try – tampeta Jul 02 '14 at 08:47

score 3 · Answer 3 · answered Jul 10 '14 at 12:36

It turns out that the socket.io was being installed in a funny folder and therefore it was not being recognised or loaded. I solved this by creating a package.json and declaring the dependencies there so that when I do npm install it installs the folder in the right place.

Also Ben Fortune was right and I also modified that...I hope this helps other people because I struggled A LOT to figure that out :)

score 1 · Answer 4 · answered Sep 09 '16 at 06:58

I was accessing IP of my cloud server to chat. suddenly The server was down.Then I got this polling error. Finally I figured out The problem is with that server.make sure your server is up.

I changed IP address to zero. please assume your server address

socket = io.connect('0.0.0.0:8110');

score 0 · Answer 5 · answered Oct 04 '21 at 01:57

0

const { Server } = require("socket.io");
const app = express();
let port = process.env.PORT || 8080;
const server = http.createServer(app);
server.listen(port, () => console.log("App listening at localhost:" + port));

It work for me :)

See doc

answered Oct 04 '21 at 01:57

Augustus Flynn

35
6

score 0 · Answer 6 · answered Jul 07 '22 at 16:13

// SERVER running on http://localhost:9000

    const PORT = 9000;    
    const http = require('http');
    
    const httpServer = http.createServer()
    
    
    const io = require("socket.io")(httpServer, {
        cors: {
            origin: "http://localhost:3000", // client address 
        },
    });   
    
    
    io.on("connection", (socket) => {
        console.log(socket)
    })
    
    httpServer.listen(PORT);



// CLIENT


    import { io } from 'socket.io-client'
    
    const URL = "http://localhost:9000";
    const socket = io(URL, { autoConnect: false });
    socket.connect();
    console.log(socket)
    
    socket.on("connect_error", (err) => {
        console.log(`connect_error due to ${err.message}`);
    });

The socket should be listening to the app (httpServer) and app should listen to the port. Don't mess it

SocketIO ERR_CONNECTION_REFUSED

6 Answers6

Linked