An unexpected error occurred: ConnectionError: HTTPSConnectionPool(host='acme-v01.api.letsencrypt.org', port=443): Max retries exceeded with url: /directory (Caused by NewConnectionError('<requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f940b6d6750>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)) Please see the logfiles in /var/log/letsencrypt for more details.