I setup mailinabox, got letsencrypt certs, and am now proceeding to use my domain on another server. Sounds easy enough. Setup the server, modify custom dns to point a-name towards new server IP, and it should show up? Nope.
The problem appears to be letsencrypt using HTST, so I can’t get the new site to load. It doesn’t have a cert. Next try was to put letsencrypt on new server, and go for issuing a new cert on the new server. That won’t work, the provisioning fails because it’s trying to use http which is preloaded to https.
I need the original cert. Where is this located so I can transfer it to my new server?