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Unable to access course or admin section

I am unable to access course or admin section today. The site was operating correctly on Friday. I have been using the latest version of Firefox v. 51.0.1 (32-bit) since January 30 without incident.

Description of problem:

The dashboard appears, but the browser hangs on a blank white screen when I attempt to access any course. When I attempt to access the admin area, I received the following warning from Firefox:

Your connection is not secure

The owner of admin.pearsonopenclass.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

Learn more...

It looks like your network security settings might be causing this. Do you want the default settings to be restored?

When I click on browser-generated Advanced button, the following additional details are provided:

admin.pearsonopenclass.com uses an invalid security certificate. The certificate is not trusted because it was signed using a signature algorithm that was disabled because that algorithm is not secure. Error code: SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED

I can get around it for now by adding a security exception; but I'd rather not have to explain such a process to all our students.
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