I am having a problem with ISA and a site that uses https. When I authenticate with the site and have the main page displayed, I can click on a link and the pdf file that the link points to is displayed. After the first link is displayed and I try another link, nothing happens. The ISA log shows a status 407 (Proxy authentication required) being returned. If I put my pc on the other side of my ISA server and connect directly with the site, everything works. I'm using IE 6 if that makes any difference. Any sugestions?