Let's Encrypt certificates are so-called Domain Validation certificates. This means that the certificate will only be issued, if you are able to prove to be the adminstrator of the domain. We prove this by making a file available in a protected directory from your site, so let's Encrypt can validate it. Therefore we require the DNS of your domain, to refer to us (the site must be live), otherwise that file can not be found on your site.
In practice it would look like this: theirs a script running on every Savvii server, that is trying to find a predefined domain (alias) for your site on our server. If found, an application is made for a certificate at Let's Encrypt and then installs the certificate. Then it takes another 10 minutes before the certificate is enabled for your site. With that being said, it should be clear that a Let's Encrypt certificate won't be available immediatly after changing the DNS. First our server should notice that the DNS is pointing to us. This lasts as long as the TTL of the DNS record. If this is set at 2 hours, then it would take up to a maximum of 2 hours and 20 minutes (and up to 30 minutes less) for your certificate to become active. It is not possible for us to bypass this or to accelerate the process.
If your website is not making use of HTTPS yet, we recommend to enable HTTPS from the moment that your website is live on our server.
If you want to enable HTTPS, immediatly after changing the DNS, you would have to request a certificate from billing.savvii.nl. For these situations we have alternative validation methods.