Web access to port 631

The server on my little home-network is running SuSE 7.1 pro. The personal forewall is installed, but not active. I want to administrate CUPS over the web. CUPS is on port 631, and I can reach it from a browser under X on the server. But when I try to reach it from the browser on a windows98 workstation the answer is: "Forbidden You don't have permission to access the resource on this server." Where can the config-error be hiding? mvh... Morten Christensen