Are you trying to access with a tld? At the moment it's only reading via IP address... have you tried accessing via IP?
As per the start/stop on the dashboard, I am currently trying to sort this out. The odd part is I tested this a dozen times over last night and it was working fine, run the update and it suddenly doesn't want to kill the service... go figure.
Also, it doesn't use your let's encrypt certs, it has it's on pem key generated in /var/lib/shellinabox that the daemon uses via systemd.
Just pushed an update that resolves the stop/start toggles on the dashboard. Tested it on 3 servers 1 dedicated and 2 VM and it fixed the issue.
Commit for review: