Hi @UFONinja
your error says: Your port 8080 is a http port, not a https port.
Checking your domain port 80 / 443 works - https://check-your-website.server-daten.de/?q=stellar7.org
Curious: Checking your port 8080 there is no answer via "check-your-website", but my browser has an answer.
http://stellar7.org:8080/
works.
So if this is your http port, you may need another port to use https. I don't know if openHAB supports two protocols on the same port (some programs do).