The requested URL could not be retrieved

用火狐27打开某网页时时出现一下界面,用ie打开却正常,咋回事

The requested URL could not be retrieved

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While trying to retrieve the URL: http://yt.linekong.com/ad.php?s2=00E04CE929ED&s3=1.01&s4=20081127070146.093 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.
Your cache administrator is xinyu@linekong.com.