Hi: I've spent some time figuring out how to use Apache 2.2 as a web app firewall, using Ubuntu server to a IIS backend. It's running, I am currently logging, not denying or blocking anything. I am having trouble wrapping my brain around this problem: www.mydomain.com on the proxy points to the front page like this: ProxyPass / http://192.168.33.12/ This forwards the server root on the front to the server root on the back. I want Apache to display custom error pages, depending on the error thrown by the backend machine. How can I do this, when the root level and everything under it is forwarded to the backend by the line above? Any help appreciated. Dan