There appears to be a problem with AUNO...

[Snakebite]

Warning: Potential Security Risk Ahead

Firefox detected an issue and did not continue to auno.org. The web site is either misconfigured or your computer clock is set to the wrong time.

It’s likely the web site’s certificate is expired, which prevents Firefox from connecting securely. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details.

What can you do about it?

The issue is most likely with the web site, and there is nothing you can do to resolve it. You can notify the web site’s administrator about the problem.

Learn more…

[Khuri]

They're using a Let's Encrypt certificate (as we do).

That problem should at best resolve itself soon, as those certificates renew themselves by default.
It's nothing to worry about though.

[Snakebite]

It is when I can't get on the site!! lol