Issue with remote access

Hello,

I am trying to get my Home Assistant remotely available but i’m getting the following error:

ERR_SSL_PROTOCOL_ERROR

I have a domain name registrered externally where I use Direct Admin to configure Let’s Encrypt. I pointed a subdomain homeassistant.domainname.nl to my external IP address and forwarded port 8123 to my Raspberry with hass.io.

When I go to http://subdomain.homeassitant.nl:8123/ it works but I want to use SSL only.

If this works I would also like to disable http access is that also possible?

Any help would be appreciated