Chrome
Your connection is not private

Firefox
This Connection is Untrusted

Internet Explorer
There is a problem with this website’s security certificate.

Opera
Invalid Certificate

Safari
Safari can't verify the identity of the website "www.yourschooldomainname.net".

The SSL on public websites whitepaper provides an explanation for this message and how to prevent it. Here's the tiny link: http://whi.pl/KB-SSLWhitePaper