I’ve never heard of that website.
Just to cover all bases, did you directly load this URL? www.tomnod.com That is the platform where we volunteer for Tomnod crowdsourcing. Right now we are doing a Weddell Seals campaign #2. Try loading the URL directly and see if you get the same error. If so, reply back so Techs can see it.
This (the Forum) is open to all “Nodders”-- people who volunteer for Tomnod. We talk about campaigns, discuss finds, and generally have fun talking.