Is it possible to use RSA 4096 rather than 2048?

Is it possible to change my site’s encryption to RSA 4096 or Elliptic Curve? If so, how? It is currently at RSA 2048 (default).

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Basically, YES.
But the “how” depends on the particular ACME client.

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Thanks for the response. I am using Azure for my website and installed the certificate with this extension: https://github.com/sjkp/letsencrypt-siteextension

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Their readme doesn’t mention it, they probably haven’t considered it, but you should ask them. (or consider changing client yourself, but that can be difficult if you are invested in this one)

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Well, their code does suggest a “range” of key sizes:

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