I have Caché/HealthShare installed in a local Ubuntu 16.04 LTS virtual machine. I've also installed Apache 2.4 from the apache2 bundle, and enabled SSL. I've configured Caché such that SSL/TLS is enabled on the SuperServer port but not required.
I had originally set up port 80 and the default site to redirect to SSL, then realized that Atelier doesn't (yet) support an SSL connection. So I created a second, non-SSL site on a different port that allows me to log into the management console without SSL either locally or from another VM (or the host operating system). However, when I configure that port number in Atelier, it complains "Not Found. Check the web server configurations."
I've tried reconfiguring port 80 such that it doesn't redirect to the SSL port, but get the same results (interestingly, with the redirect in place I get "Found" in red when I test the port, but Atelier won't actually connect).
The next step is to re-enable the "private" web server and see if that works. But I'm hoping that Atelier will work with the external server too.