https://einsteintoolkit.org exists but has an invalid security certificate (http://www.sslshopper.com/ssl-checker.html#hostname=einsteintoolkit.org). I don't think we need SSL/TLS on this server. It should either be disabled or a valid certificate used.
The same applies to https://cactuscode.org (http://www.sslshopper.com/ssl-checker.html#hostname=cactuscode.org).
Note that Frank's page (http://www.cct.lsu.edu/~knarf/cgi-bin/monitor.cgi) reports these certificates as self-signed; they are also expired. Self-signed certificates on public websites are bad: they encourage people to click through the warnings.