vagrant上のcentOSでtelnetができない

vagrant上のcentOSでnodejsで作ったTCPエコーサーバにtelnetで通信をしたいのですが行き詰まってるので教えて下さい。

サーバ起動後、サーバが待機状態に入り、

linux
1[vagrant@vagrant-centos64 tcp]$ node tcp_echo_server.js
2Listening Start on Server - 192.168.33.10:8888
3connections property is deprecated. Use getConnections() method
4Connection start (1/3) - 192.168.33.10:58148
5/home/vagrant/tcp/tcp_echo_server.js:31
6	clients[key] = new Client(socket);
7	^
8ReferenceError: clients is not defined
9    at Server.<anonymous> (/home/vagrant/tcp/tcp_echo_server.js:31:2)
10    at Server.emit (events.js:129:20)
11    at TCP.onconnection (net.js:1332:8)

別ターミナルからクライアントへ接続しようとすると

linux
1[vagrant@vagrant-centos64 ~]$ telnet 192.168.33.10 8888
2Trying 192.168.33.10...
3Connected to 192.168.33.10.
4Escape character is '^]'.
5Connection closed by foreign host.

「Connection closed by foreign host.」とエラーが出てしまいます。

参考にしたサイト

node
1// 省略
2// nodejsサーバ
3server.listen(8888, '192.168.33.10', function(){
4    var addr = server.address();
5    console.log('Listening Start on Server - ' +
6                             addr.address + ':' + addr.port);
7});
8// 省略

linux
1// host確認
2$ hostname
3vagrant-centos64.vagrantup.com
4
5$ uname -a
6Linux vagrant-centos64.vagrantup.com 2.6.32-358.23.2.el6.x86_64 #1 SMP Wed Oct 16 18:37:12 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
7
8// 設定事項
9$ vim /etc/sysconfig/network
10HOSTNAME=vagrant-centos64.vagrantup.com
11NETWORKING=yes
12
13$ hostname vagrant-centos64.vagrantup.com
14
15$ vim /etc/resolv.conf
16; generated by /sbin/dhclient-script
17search tokyo_net.hal.ac.jp vagrantup.com
18nameserver 10.0.2.3
19
20$ vim etc/hosts
21127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
22::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
23192.168.33.10 vagrant-centos64.vagrantup.com