Socket.io无法从客户端连接到服务器

首先我的server.js端代码是：

var socket = require( 'socket.io' ); var requestify = require('requestify'); var express = require('express'); var app = express(); var server = require('http').createServer(app); var io = socket.listen( server ); var port = process.env.PORT || 3000; server.listen(port, function () { console.log('Server listening at port %d', port); }); 

但是，此服务器代码在分配的端口中运行良好。

现在我的客户端代码是：

 var socket = io.connect( 'http://'+IP_ADDRESS+':3000', {query:'userId='+userId+'&orgId='+orgId}); console.log(socket); socket.on('connect', function() { console.log('check 2', socket.connected); // alert(socket.connected); }); 

这不是在活服务器上工作 ，但在本地（xampp）服务器上工作绝对正常。 socket.on函数不响应。 在控制台日志中，套接字的控制台给出：

 socket.io-client:url parse http://52.40.237.147:3000 +0ms 2017-03-08 11:20:59.026 socket.io.js:2708 socket.io-client new io instance for http://52.40.237.147:3000 +1ms 2017-03-08 11:20:59.030 socket.io.js:2708 socket.io-client:manager readyState closed +2ms 2017-03-08 11:20:59.030 socket.io.js:2708 socket.io-client:manager opening http://52.40.237.147:3000 +3ms 2017-03-08 11:20:59.032 socket.io.js:2708 engine.io-client:socket creating transport "polling" +0ms 2017-03-08 11:20:59.034 socket.io.js:2708 engine.io-client:polling polling +1ms 2017-03-08 11:20:59.034 socket.io.js:2708 engine.io-client:polling-xhr xhr poll +1ms 2017-03-08 11:20:59.036 socket.io.js:2708 engine.io-client:polling-xhr xhr open GET: http://52.40.237.147:3000/socket.io/? userId=9&orgId=3&EIO=3&transport=polling&t=LgiQhOy +1ms 2017-03-08 11:20:59.037 socket.io.js:2708 engine.io-client:polling-xhr xhr data null +1ms 2017-03-08 11:20:59.039 socket.io.js:2708 engine.io-client:socket setting transport polling +3ms 2017-03-08 11:20:59.040 socket.io.js:2708 socket.io-client:manager connect attempt will timeout after 20000 +9ms 2017-03-08 11:20:59.041 socket.io.js:2708 socket.io-client:manager readyState opening +2ms 2017-03-08 11:20:59.042 (index):1022 

伙计们，我无法弄清楚这个问题。 为什么不连接到服务器。