The requested URL could not be retrieved

ERROR

The requested URL could not be retrieved

While trying to retrieve the URL:

The following error was encountered:

Unable to forward this request at this time. This request could not be forwarded to the origin server or to any parent caches. The most likely cause for this error is that:

The cache administrator does not allow this cache to make direct connections to origin servers, and All configured parent caches are currently unreachable.

我当时遇到的时候是因为防火墙问题：

[root@cloud init.d]# ./iptables stop 
iptables：清除防火墙规则： [确定] 
iptables：将链设置为政策 ACCEPT：filter [确定] 
iptables：正在卸载模块： [确定] 
[root@cloud init.d]#

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