6003 Invalid request headers

IMHO, using nginx is better than using NPM.

That said, if you are doing DNS-01 authentication, the web service is irrelevant [for cert renewals].
All that matters is using an ACME client that supports your DSP [DNS Service Provider = CloudFlare].

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I'm unsure of how to do it. I'm also using pfSense. Should I think about running HAProxy/ACME instead?

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