The site is down, as it was some weeks before. Back then I had sent Ren a message, but I did not get a reply. It came back online without notification, so I guess whatever is wrong with the site will be solved soon. Unfortunately I can´t do much about it now, because I´m on vacation, away from my equipment.
However, the server itself is still online, the container client is still running the ISS. If you want, I can send you a download link to the client on an alternative site via PM.