I deployed the ubuntu image in the cert-manager namespace. Please see below output.
curl https://acme-staging-v02.api.letsencrypt.org/directory
{
"keyChange": "https://acme-staging-v02.api.letsencrypt.org/acme/key-change",
"meta": {
"caaIdentities": [
"letsencrypt.org"
],
"termsOfService": "https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf",
"website": "Staging Environment - Let's Encrypt"
},
"newAccount": "https://acme-staging-v02.api.letsencrypt.org/acme/new-acct",
"newNonce": "https://acme-staging-v02.api.letsencrypt.org/acme/new-nonce",
"newOrder": "https://acme-staging-v02.api.letsencrypt.org/acme/new-order",
"revokeCert": "https://acme-staging-v02.api.letsencrypt.org/acme/revoke-cert",
"rowsGKH3bqc": "Adding random entries to the directory"
}#
telnet acme-staging-v02.api.letsencrypt.org 443
Trying 184.50.102.158...
Connected to e14990.dscx.akamaiedge.net.
Escape character is '^]'.
^].
Connection closed by foreign host.