First I installed let's encrypt with apt-get and the second time with certbot Now it is broken, sites are offline Plugins selected: Authenticator nginx, Installer nginx Obtaining a new certificate Performing the following challenges: http-01 challenge for XXXXXXXXXXX.com http-01 challenge for www.tXXXXXXXXXXXXXXXXXXt.com Using default address 80 for authentication. Using default address 80 for authentication. Waiting for verification... Cleaning up challenges Could not open file: /etc/nginx/sites-enabled/100-XXXXXXXXXXXXXXXX.com.vhost Could not open file: /etc/nginx/sites-enabled/default Could not open file: /etc/nginx/sites-enabled/100-tXXXXXXXXXXXX.xxxy.vhost Could not open file: /etc/nginx/sites-enabled/000-apps.vhost Could not open file: /etc/nginx/sites-enabled/100-XXXXXXXXXXXXX.com.br.vhost Could not open file: /etc/nginx/sites-enabled/000-ispconfig.vhost Could not open file: /etc/nginx/sites-enabled/100-XXXXXXXXXXXXXXXt.com.vhost Could not open file: /etc/nginx/sites-enabled/default Could not open file: /etc/nginx/sites-enabled/100-tXXXXXXXXXXXXXXXX.vhost Could not open file: /etc/nginx/sites-enabled/000-apps.vhost Could not open file: /etc/nginx/sites-enabled/100-XXXXXXXXXXXXXXXXbr.vhost Could not open file: /etc/nginx/sites-enabled/000-ispconfig.vhost Could not automatically find a matching server block. Set the `server_name` directive to use the Nginx installer. IMPORTANT NOTES: - Unable to install the certificate - Congratulations! Your certificate and chain have been saved at: /etc/letsencrypt/live/xxxxxxxxxxxx.com-0001/fullchain.pem Your key file has been saved at: /etc/letsencrypt/livexxxxxxxxxxxx.com-0001/privkey.pem Your cert will expire on 2018-04-28. To obtain a new or tweaked version of this certificate in the future, simply run certbot-auto again with the "certonly" option. To non-interactively renew *all* of your certificates, run "certbot-auto renew" [email protected]:~#] I tried to do a reinstall of the apt-get but no result.