In Getting Perl Package Manager to work I wrote that I could get Perl Package Manager to work if I removed the environment variable http_proxy. The reason it worked was because I had already installed a firewall rule that allowed anonymous access for http. If I specified the environment variable I would get slammed with 407 authentication error. Today I got a 403 error while running ppm. I eventually figured out that I did not have a firewall rule to allow anonymous http access since I upgraded to ISA 2004. I knew I had some trouble shooting in front of me when Firefox had a problem yesterday.