apache vhost问题

apache vhost问题

<VirtualHost *:8000>
DocumentRoot "/var/www/usage/"
ServerName vhost1
<Directory "/var/www/usage/">
allow from all
Options +Indexes
</Directory>
</VirtualHost>

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然后重启apache服务.成功,配认的80端口能够打开.可是:http://192.168.0.23:8000 却不能访问,该页无显示.请问是什么问题,是那里配置错了吗>谢谢!
Listen 8000