Second try, did not get any response on the first one and I really could use some help on this one. Please...... I'm trying to setup webserver publishing through a caching only ISA server, situated behind a PIX firewall. Currently a MS Proxy 2 server is handling this and this works well, however if I try to do a similar setup on ISA I keep getting the HTTP 407 Proxy Authentication Required (12209) Setup is as follows: Pix does a mapping from the external IP (194.x.x.x) to an internal IP (172.x.x.x) Unihomed ISA server has (172.x.x.x) as second IP number on the network interface. This (172.x.x.x) is configured on the ISA as listener for incoming web requests on port 80, no authentication required. Destination set created 194.x.x.x, path: /test/* Web publishing rule created, using above destination set to point to an internal IIS server, http://webserver/test, anonymous access allowed. When connecting from the Internet to http://194.x.x.x/test, I get the HTTP 407 error from the ISA server that's handling the web publishing. What am I missing here, or can't this be done like this ? tia, Peter