[SQU] Access Denied

Hi,
        I have an issue with a website that Squid is not allowing one of my users
to go to. This is the website:
http://www.avweb.com:81/common/msg/srchmsgs.cgi

It doesn't seem to like the :81 part does anyone have an idea of what is
going on. Here is the message I get when accessing the site:

ERROR
The requested URL could not be retrieved

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

----
While trying to retrieve the URL:
http://www.avweb.com:81/common/msg/srchmsgs.cgi
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.
----------------------------------------------------------------------------
---- (Squid/2.2.STABLE5)
Any help would be greatly appreciated!
Tom Hettick
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