Create a domain in ispconfig how your normally would with ssl
make sure you have proxy http enabled
sudo a2enmod proxy_http
ServerName domain.com
ProxyPass /.well-known !
ProxyPass “/” “http://DockerIp:DockerPort/”
ProxyPassReverse “/” “http://DockerIp:DockerPort/”
RedirectMatch ^/$ https://domain.com
SSLEngine on
SSLCertificateFile /etc/letsencrypt/live/domain.com/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/domain.com/privkey.pem
Replace http://DokcerIp:DockerPort/ with your info
domain.com with your domain or sub domain name