after giving the command < certbot --apache > on a newly installed Debian 8.0 server I get the following error:
1: impera.datacloud4u.nl
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Starting new HTTPS connection (1): acme-v01.api.letsencrypt.org
Obtaining a new certificate
Performing the following challenges:
Client with the currently selected authenticator does not support any combination of challenges that will satisfy the CA.
Client with the currently selected authenticator does not support any combination of challenges that will satisfy the CA.
What is going wrong?