When a domain has a lot of subdomains, it is quite easy to hit the rate limit: https://letsencrypt.org/docs/rate-limits/ Instead you can define the certificate manually in `security.acme.certs` and list the subdomains in the `extraDomains` option.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.