Trying to login to the new eisy-ui I enter https://eisy.local:443 and it brings up the standard login, asking for my portal email and password. After entering, I immediately get "Network Error" and no login. I can access eisy normally using AC. Any ideas?

A common thread has been safari, as the browser, giving that error. It's a reason I haven't ventured in yet.

Quite correct! Firefox lets me in.

I had the same issue after a macOS update. The fix in Safari is to access eisy-ui using http://eisy.local:443. Remove the "s" in the address. I assume it has something to do with a certificate, but I don't understand enough about them to figure out what's wrong. Before the macOS update, the secure address using https worked.