You dont have a proper SSL setup on your server. Your port 443 does not serve HTTPS but HTTP. Reconfigure that and make sure you have a valid certificate and you should be good to go.
Any links to set it up properly, I’ve tried couple of ways it didn’t work.
Also why does it work for doapp.yachtingsbest.com it’s the exact same server as justwork.swiftharbour.com they both point to the same server, can you explain?