@jillian for the list of "Notes and Starting Points for Specific Clients", I would like to mention that for ASP.NET developers who use the LettuceEncrypt library as their Let's Encrypt client, there's GitHub issue [Question] How to renew certificates to fix Let's Encrypt revocations bug · Issue #238 · natemcmaster/LettuceEncrypt · GitHub which contains a solution for this problem.
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