we are currently unable to login into any of our tenant account through the auth0 API as the *.au.auth0.com domain certificate expired.
This results in an exception “The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.” and the login request to fail.
This is affecting our production environment and preventing clients from logging in.
Looks like they’re aware of the issue: http://status.auth0.com/?region=AU&environment=Production&type=critical
Seems to be fixed now[/Edit]
Indeed - as @d.seaman mentioned, we had a temporary issue with our AU certificate. However, this was promptly resolved.
You can find more information about this in the status page for this specific incident.
Thanks for your patience, and we apologize for any disruptions this might have caused to your services.