Before using Certbot, configure Certbot to trust your root CA certificate using the REQUESTS_CA_BUNDLE environment variable.

• For example, to set the REQUESTS_CA_BUNDLE environment variable on Windows:

  set REQUESTS_CA_BUNDLE=<root-CA-cert-file>

  Where <root-CA-cert-file> is the path and file name of the root CA certificate file. For example:

  set REQUESTS_CA_BUNDLE= "C:\root_ca.crt"

• For example, to set the REQUESTS_CA_BUNDLE environment variable on Linux:

  sudo REQUESTS_CA_BUNDLE=<root-CA-cert-file>

  Where <root-CA-cert-file> is the path and file name of the root CA certificate file. For example:

  sudo REQUESTS_CA_BUNDLE=/tmp/root_ca.crt