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Websites that are accessed via a reverse proxy only need to be secured as far as the proxy using an SSL certificate. This means that access is also protected via authentication.

Let's Encrypt certificates with DNS validation can only be automatically issued and renewed if the DNS provider facilitates an API. If this is not the case, one can use the name servers of deSEC and their API.

Since 2018, Let's Encrypt has offered the option of issuing so-called "wildcard certificates". This eliminates the need to issue individual certificates in a multi-sub-domain setup.