There seems to be a problem, maybe having to do with self-signed certificates. I understand the value of using a cert authority, but my hosting provider charges serious money for certs (I also understand I need a host that supports Let's Encrypt!) and the sites I'm running aren't revenue sources.
Sometimes updates, for example, would work. Or, I would set up a site, and it would be OK through the dashboard, but the next day it would just return errors. Sometimes I could see Advanced Tools, sometimes an error message. And this is for sites all running on the same host.
More than that, it's just a guess what the problem is. The logging is completely unhelpful. It gives no information about errors -- it doesn't report errors at all, only successes.
Disabling for now...
Revisiting this plugin, I installed "Let's Encrypt" certs on the sites I manage. It works fine on most of them now. The only exception is a blog that's running on Site5 -- there might be a firewall or something in between. But for the rest of them it's proving to be really helpful. Adding a star.
Thank you for updating the UI -- it's MUCH easier to read and work with now. Adding another star...