Configuration error in Axent Raptor Firewall 6.5 allows remote attackers to use the firewall as a proxy to access internal web resources when the http.noproxy Rule is not set.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2001-0479
http://www.securityfocus.com/bid/2517
http://www.securityfocus.com/archive/1/171953
http://archives.neohapsis.com/archives/bugtraq/2001-03/0359.html