OpenVPN Access Server Error with LE - "Certificate Trust Warning - unable to get local issuer certificate"

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Welcome to the community @TeleBrady

I don't have any great insights. I am not expert in OpenVPN servers. But, a couple things:

  1. Instead of using cat and copy/paste use just cp or add >filename.pem to end of cat. That avoids possible extra pieces in the resulting cert file
  2. The best way to use openssl for verify is found here

I searched this forum for OpenVPN and there is not much info. But, depending on your purpose for OpenVPN and its package you may not need Let's Encrypt certs at all. I know nothing more than what is provided in below post from credible source:

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