[squid-users] 111 connection refused

Hello:

I have a firewall/proxy server that gives me problems when I access a
web page of a site, Squid shows me the next message:
"111 connection refused".

I access http://www.aduanet.gob.pe/aduanas/informao/HRMCManifM.htm
then I write "2006" and "2637" in the textboxes, and then Squid shows
me the error message.

Why does it happen?

I hope you could help me. Thanks.

--
Paul