Open challenge links through our HTTP proxy

Web challenges usually run on a port of their own, like http://chatelaine.cylabacademy.net:21559, and many school networks block those ports. Turn on HTTP proxy under Challenge Links in your account settings, and challenge links switch to the standard web port, like http://21559.chatelaine.cylabacademy.net, which networks usually allow.

Some challenges may not work through the proxy, and it only helps with web challenges. For the rest, use the webshell. If you manage a school network, the Educators FAQ lists the hosts to allow.