access denied in http acceleration mode

I have set up squid on the machine: proxy.something.com as an http
accelerator for the site: http://www.something.com but when I try to see
the page I get the following message:

ERROR
The requested URL could not be retrieved

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

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.

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Generated Sat, 15 Apr 2000 00:16:18 GMT by proxy.something.com
(Squid/2.0.PATCH2)

What should I do in order to finally see the site?
Received on Fri Apr 14 2000 - 19:26:10 MDT