Technical difficulties (Update: FIXED!)

Update: The technical difficulties that have lead to a “Forbidden” error message have been figured out and fixed by the team. A big “thank you” goes to Radbound UMC 🙂

We are sorry to inform you that we are facing technical difficulties at the moment that we are trying to sort out as soon as possible. At the moment, you will receive a “Forbidden” message when trying to create your algorithm on grand-challenge. We hope that this will be fixed soon.


  1. Hello,

    I am still experiencing the FORBIDDEN error message. Are you sure it’s fixed or do I need to do something special to avoid it?


  2. Dear Rutger,

    if I’m correct then you have not yet joined the challenge. This is a requirement in order to be able to upload an algorithm. Please contact me, if this should not resolve the issue.



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