TL;DR The forums are now live at a new location, http://forums.casc.on.ca
Use your previous login and password.
If you don't remember your password you can reset it yourself with the Forgot password or user name? link on the login form BUT you have to have access to the email address related to your account.
If you need help, write forums@casc.on.ca and someone will assist you.
If you'd like the more complete explanation of what happened, though ... Read more »