Currently using firefox, but chrome also suffers from this problem. I should say I'm not using the appliance, but running other linux version. Anyway, here's what firefox error page prints.

cdn.cs50.net uses an invalid security certificate.

The certificate is only valid for the following names:
cloudfront.net, *.cloudfront.net

(Error code: ssl_error_bad_cert_domain)



Do you have hosts modifications such as adblockers, security proxies, etc? Sounds like

  1. hijacked connection

  2. a self installed certificate that is overriding the sites declaration

Try opening it in a private window which will ignore stored certificates, partially anyhow

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