But it is possible to have initial certificates without opening anything: https://gruchalski.com/posts/2021-06-04-letsencrypt-certificates-for-local-development

But it is possible to have initial certificates without opening anything: https://gruchalski.com/posts/2021-06-04-letsencrypt-certificates-for-local-development/ https://gruchalski.com/posts/2021-06-04-letsencrypt-certific... From there, it’s possible to use HTTPS negotiation.