I have been having this same issue, too. I was able to just press "Yes" or "No" to get past the error randomly, about 50% of the time.

I would be wired directly into the router. I have been having this for a couple of days, I think...?

However, today, I was not. The error blocked me from seeing anything.
https://imgur.com/MLwij1O

After turning back on Internet Explorer, I did all the above steps in the original post, and I was FINALLY able to make it past the errors (plural now?!).
However, I am terrified to log out, risking not being able to log back in, and being blocked by these errors.