In Improving the Secured File Download UX for Unauthenticated Users I elaborated on a workaround hack to display a friendly error message and redirect to the login page when trying to access a file that had been through DotNetNuke's file ticket system...
DotNetNuke has extensive security features. One of which is enforcing role based permissions when accessing files. The general workflow is to say that "Registered Users" get to see a particular file, you then create a link to that file using DNN, and...