When I try to access CS50 Submit via Chrome (within the ApplianceI ) I get the big 403 "not allowed" page that others have mentioned. I can bypass this by using the link posted by Rob Bowden in another thread on this issue.

But when I click "Add Files" I do not get an "Open Files" window as the "How to Submit" section on pset1 says I should. Rather, I get a high-level summary of my hard drive contents from which I'm unable to access the contents of the Appliance.

I get the same results using both OS X v10.8.5 and Windows 7 Premium. I am enrolled in CS50 through edX.

  • Can you access your Dropbox folder on your local machine (not the appliance)?
    – lethaljd
    Aug 18, 2014 at 12:19
  • For what it's worth - I never submit through the appliance. I have always submitted using Chrome on my Mac and just upload the files directly from my Dropbox folder since it is in sync with my Appliance dropbox folder. This method works fine.
    – lethaljd
    Aug 18, 2014 at 14:01
  • Could you post a screenshot of the folder contents which you're referring to? It may help to clarify what you're seeing, and how to access the files. Aug 18, 2014 at 15:39

1 Answer 1


I just found a reddit CS50 forum post with a link for edX CS50ers to use to submit pest files using the appliance. It works. Here's the link:


It takes me to the edX login page and then directly to the CS50 submit page. The "add files" button then produces my Dropbox contents. So I probably overlooked something about how edX users are supposed to submit files when I was getting started with CS50.

Thanks very much for your replies.

BTW: I can access Dropbox on my machine; I didn't know it was possible to submit psets without using the appliance; the screen that I was getting when I clicked "add files" before is essentially the same thing one gets when getting the contents of your HD from Windows after clicking on your user name.

  • Don't forget to accept your answer if it resolved the problem.
    – Calculemus
    Jan 6, 2015 at 5:14

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .