Manual Certificate Issuing

Will Let’s Encrypt CA be able to manually issue certificates without any installation to the server’s computer? If yes, through which procedure and how?

Yes, you can select manual authentication using the offiical Let’s Encrypt client.

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You do need to run the software somewhere, but I guess it doesn’t need to be running as root. So it depends on what you mean by “installed”. Some software has to speak the ACME protocol the the certificate authority, and some software has to perform the verification step or tell the user how to perform the verification step.

It would be possible to speak the ACME protocol using an external HTTPS client like curl, but this would be extremely technically complex and time-consuming. So almost all users will want to use an ACME client application of some kind.

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And just BTW I think the title ‘Manual Certificate Issuing’ would be a better one, as the actual one can be mistaken for something like this question: https://community.letsencrypt.org/t/is-it-possible-to-use-an-already-created-key-pair

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@Jason: Yes.

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