"it sounds like you have MzScheme facing the open internet?" Yep. The arc webserver runs directly on port 80, for which it needs to run as root. To avoid all s

"it sounds like you have MzScheme facing the open internet?" Yep. The arc webserver runs directly on port 80, for which it needs to run as root. To avoid all sorts of security headaches, it runs: (setuid 2) soon after startup. The whole thing seems hacky.