求救squid代理服务器问题

jbt.zh

我是一名菜鸟，昨天根据一本linux的书装了一个red hat linux，想用它来建一个代理服务器，我用的是squid来做的，但是最后在浏览器中不能上网，出现如下信息：
ERROR
The requested URL could not be retrieved

--------------------------------------------------------------------------------

While trying to retrieve the URL: http://www.sina.com.cn/

The following error was encountered:

Access Denied.
Access control configuration prevents your request from being allowed at this time. Please contact your service provider if you feel this is incorrect.

Your cache administrator is [email protected].



--------------------------------------------------------------------------------

Generated Tue, 22 Jun 2004 08:17:39 GMT by proxy (squid/2.5.STABLE1)

各位高手能帮我看看是什么原因吗？谢谢了