apache反向代理后，一级域名总是跳转到二级域名指向的端口

Question

我的需求如下：

www.main.com 指向ip 111.111.111.111:80；
子域名sub.main.com 指向ip 111.111.111.111:9500；

apache做完反向代理后，无论访问www.main.com还是sub.main.com都会跳转到111.111.111.111:9500

如何解决。

配置文件如下
NameVirtualHost *:80

<VirtualHost *:80>

    ServerName sub.main.com
    ProxyRequests off
    <proxy http://sub.main.com>
            Options MultiViews
            AllowOverride None
            Order allow,deny
            Allow from all
    </proxy>
    ProxyPass / 111.111.111.111:9500/
    ProxyPassReverse / 111.111.111.111:9500/
    </VirtualHost>

<VirtualHost *:80>

    ServerName www.main.com
    ProxyRequests off
    <proxy http://www.main.com>
            Options MultiViews
            AllowOverride None
            Order allow,deny
            Allow from all
    </proxy>
    ProxyPass / http://111.111.111.111:80/
    ProxyPassReverse / 111.111.111.111:80/

</VirtualHost>