Could not obtain directory: cURL error 6: Could not resolve host: acme-v01.api.letsencrypt.org; Name or service not known

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{
"key-change": "https://acme-v01.api.letsencrypt.org/acme/key-change",
"meta": {
"caaIdentities": [
"letsencrypt.org"
],
"terms-of-service": "https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf",
"website": "https://letsencrypt.org"
},
"new-authz": "https://acme-v01.api.letsencrypt.org/acme/new-authz",
"new-cert": "https://acme-v01.api.letsencrypt.org/acme/new-cert",
"new-reg": "https://acme-v01.api.letsencrypt.org/acme/new-reg",
"r86q-WD7x4M": "Adding random entries to the directory",
"revoke-cert": "https://acme-v01.api.letsencrypt.org/acme/revoke-cert"
}