CAS-ifying uploaded files

Hello Support,

I have couple of questions:  we need to start uploading our monthly info sessions decks as a PFD  on our site.   We would like to make them so the files  require a cas login before opening them.   I’m working in dev.facultyadmin.yale.edu and  I’m getting the error message - This site can’t be reached  - cas’s server DNS address could not be found..   Is this because I’m in dev site and not our live site?   Or, am I missing something with the set up process?    Next question, do you have any other suggestions how I might go about listing the files as we upload them?    Thanks.  Audrey