Squid Newbie

I have just installed Squid on my RedHat Linux 7.3 machine and have it configured with mostly the defaults and I control it through webmin.

Problem is, when I configure my browser to use that box as a proxy server I get the following error...

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ERROR
The requested URL could not be retrieved

While trying to retrieve the URL: http://www.google.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.

Your cache administrator is webmaster.
Generated Thu, 03 Jul 2003 18:45:08 GMT by localhost.localdomain (squid/2.5.STABLE3)
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Anyone have any suggestions?