node.js - .isAuthenticated() returns false even if I am logged in -

i have been working on project requires github log in , used passport-github2 npm, reason, after log in (i did console.log success message if logged in), when run .isauthenticated() returns false. set session cookie , all, , don't know what's wrong it.

here code auth.js file

const express = require('express'); const router = express.router(); const githubstrategy = require('passport-github2'); const passport = require('passport'); const user = require('../models/user.model'); const venue = require('../models/venue.model');  router.post('/', (req, res) => { if (req.user) {     //first check see if user attending bar, if decrement     venue.findoneandupdate({         id: req.body.barid,         totalattending: 1,         usersattending: req.user.username || req.user.displayname     },         { $set: { 'totalattending': 0 } },         { new: true },         (err, venue) => {             if (err) throw err;             if (!venue) {                 venue.findoneandupdate({ id: req.body.barid },                     { $inc: { 'totalattending': 1 }, $addtoset: { 'usersattending': req.user.username || req.user.displayname } },                     { new: true },                     (err, venue) => {                         if (err) throw err;                         res.send('done');                     });             } else {                 res.send('done');             }         }     );  } else {     res.send('please sign in first'); } });   router.get('/', passport.authenticate('github'));  //passport setup passport.use(new githubstrategy({ clientid: "e5b156bfabd594e3ce1e", clientsecret: "e5e13f4d75a3046aa4e1d581fc635702ceadc209", callbackurl: "https://nightlife-app-elisal.c9users.io/auth/github/callback" }, (accesstoken, refreshtoken, profile, done) => {     //create user     user.findone({ username: profile.username }, (err, user) => {         if (err) return done(err);         if (!user) {             var newuser = new user({                 username: profile.username,                 displayname: profile.displayname             }).save((err, user) => {                 console.log('error');                 if (err) throw err;                 done(null, user);             });         } else {             done(null, user);         }     }); } ));  passport.serializeuser((user, done) => { done(null, user); });  passport.deserializeuser((user, done) => { done(null, user); });   router.get('/callback', passport.authenticate('github', { failiureredirect: '/' }), (req, res) => {     res.redirect('/');     console.log("you're logged in"); });  module.exports = router; 

and here server.js file

const yelp = require('yelp-fusion'); const express = require('express'); const app = express(); const token = "xxxxxxxxxx"; const client = yelp.client(token); const home = require("./routes/home"); const mongoose = require("mongoose"); const passport = require('passport'); const session = require("express-session"); const auth = require("./routes/auth");  mongoose.connect('xxxxxxxx'); var db = mongoose.connection; db.on('error', console.error.bind(console, 'connection error')); db.once('open', () => {   console.log('connection database successful'); });  app.use(passport.initialize()); app.use(passport.session()); app.use(express.static(__dirname + '/public')); app.set('port', process.env.port || process.env.ip ); app.set('view engine', 'ejs'); app.use(session({ secret: 'elktrjosd0983jlwsf08easd90', resave: true, saveuninitialized: true, }));  //sets links different sites app.use("/", home); app.use("/auth/github", auth);  //starts port var port = process.env.port || 3000; app.listen(port,  function () { console.log('node.js listening on port ' + port + '...'); }); 

does know why .isauthenticated() returns false , how solve it?