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Accepted Answer
Their service seems to be down. Multiple users reporting issues. See here
As was pointed out by several others over the course of this thread the error is a result of an ongoing service disruption. Please follow status.letsencrypt.org for more information. We should have all of the remaining issues resolved shortly.
… As well if you have already used that cmd and issued a valid SSL to your domain, why do you need to do so in such a short time and before renewal.