How to fix Error: listen EADDRINUSE while using nodejs isn't working, what else can I do?

I know this question was asked already, but the solutions provided didn't work for me.

Here is the websocket server code

const https = require('https'); const fs = require('fs'); const path = require('path'); const WebSocket = require('ws'); let connectionsList = []; /* */ var server = https.createServer({ cert: fs.readFileSync(path.resolve(__dirname, '../cert/certificate.crt')), key: fs.readFileSync(path.resolve(__dirname, '../cert/private.key')) }, function (request, response) { console.log((new Date()) + ' Received request for ' + request.url); response.writeHead(404); response.end(); }); wsServer = new WebSocket.Server({ server }); function originIsAllowed(origin) { // put logic here to detect whether the specified origin is allowed. return true; } wsServer.on('connection', function (connection) { //save new connections here connectionsList.push(connection); connection.on('message', function (message) { const data = JSON.parse(message) || null; if (data !== null && data.type === 'push') { connectionsList.forEach((connection, index) => { //Must Skip First Item This One Pumps Data To The Others if (index > 0) { if (connection.state === 'closed') { ConnectionsList.splice(index); } connection.send(JSON.stringify(data.message)); } }) } }); }); wsServer.on("error", function(err){ console.log(err); }); module.exports = server; 

Here is the runner or starter

// A simple pid lookup var exec = require('child_process').execFile; const wss = require('./ws_server/wss'); const config = require('./config'); var fun = function () { const process = exec(`${config.EXE.PATH}/${config.EXE.NAME}`, function () { wss.close(); fun(); }); //if process is created, then makea websocket server if (process.pid != null && process.pid !== undefined) { try{ wss.on('error', function(error){ console.log(error); }); wss.listen({port: config.PORT,host: config.HOST}, function () { console.log((new Date()) + ` Server is listening on port ${config.PORT}`); }); } catch(err){ } } } fun(); 

I keep having this error below even after I have checked and can't find anything using that port. I have tried all the approached mentioned from the here How to fix Error: listen EADDRINUSE while using nodejs?

but nothing seems to work for me, please can anyone explain to me what's really the problem here. I am using windows server to run this nodejs script. thanks

How to fix Error: listen EADDRINUSE while using nodejs?