[root@web ~]# ifconfig ens32: flags=4163 mtu 1500 inet 176.74.8.66 netmask 255.255.255.240 broadcast 176.74.8.79 inet6 fe80::250:56ff:fe86:4d4a prefixlen 64 scopeid 0x20 ether 00:50:56:86:4d:4a txqueuelen 1000 (Ethernet) RX packets 188 bytes 25103 (24.5 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 187 bytes 23818 (23.2 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73 mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1 (Local Loopback) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@web ~]# traceroute acme-v01.api.letsencrypt.org traceroute to acme-v01.api.letsencrypt.org (23.77.91.5), 30 hops max, 60 byte packets 1 176.74.8.77 (176.74.8.77) 0.204 ms 0.268 ms 0.223 ms 2 10.129.0.15 (10.129.0.15) 1.040 ms 0.958 ms 1.055 ms 3 176.74.8.80 (176.74.8.80) 1.920 ms 2.058 ms 2.060 ms 4 ae11-238.RT.MR.MSK.RU.retn.net (87.245.253.81) 2.081 ms 2.028 ms 1.982 ms 5 ae1-5.RT.IRX.FKT.DE.retn.net (87.245.232.245) 38.263 ms 38.370 ms 38.378 ms 6 213.198.77.213 (213.198.77.213) 38.833 ms 38.579 ms 38.577 ms 7 ae-24.r24.frnkge08.de.bb.gin.ntt.net (129.250.3.217) 38.357 ms 38.231 ms 38.449 ms 8 ae-5.r24.londen12.uk.bb.gin.ntt.net (129.250.3.12) 51.912 ms 53.148 ms 49.928 ms 9 ae-8.r02.londen03.uk.bb.gin.ntt.net (129.250.4.22) 51.992 ms 49.887 ms 48.874 ms 10 67.111.22.80.ptr.us.xo.net (67.111.22.80) 50.432 ms 49.996 ms 51.090 ms 11 207.88.13.56.ptr.us.xo.net (207.88.13.56) 170.776 ms 173.933 ms 170.319 ms 12 207.88.12.211.ptr.us.xo.net (207.88.12.211) 170.820 ms 174.510 ms 174.387 ms 13 207.88.12.208.ptr.us.xo.net (207.88.12.208) 174.336 ms 174.633 ms 174.469 ms 14 207.88.13.123.ptr.us.xo.net (207.88.13.123) 173.643 ms 175.377 ms 170.783 ms 15 207.86.208.34 (207.86.208.34) 189.575 ms 189.529 ms 189.404 ms 16 acme-v01.api.letsencrypt.org (23.77.91.5) 177.325 ms 174.218 ms * [root@web ~]# curl -v -4 https://acme-v01.api.letsencrypt.org/directory * About to connect() to acme-v01.api.letsencrypt.org port 443 (#0) * Trying 23.77.91.5... * Connected to acme-v01.api.letsencrypt.org (23.77.91.5) port 443 (#0) * Initializing NSS with certpath: sql:/etc/pki/nssdb * CAfile: /etc/pki/tls/certs/ca-bundle.crt CApath: none * SSL connection using TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 * Server certificate: * subject: C=US,ST=California,L=Mountain View,O=INTERNET SECURITY RESEARCH GROUP,CN=*.api.letsencrypt.org * start date: Jun 26 17:05:45 2015 GMT * expire date: Jun 25 17:05:45 2018 GMT * common name: *.api.letsencrypt.org * issuer: CN=TrustID Server CA A52,OU=TrustID Server,O=IdenTrust,C=US > GET /directory HTTP/1.1 > User-Agent: curl/7.29.0 > Host: acme-v01.api.letsencrypt.org > Accept: */* > < HTTP/1.1 200 OK < Server: nginx < Content-Type: application/json < Content-Length: 561 < Replay-Nonce: l2SBvQnbr-SRISkHfA6kEZbmwD3J0yRVpcs2XaLg9ds < X-Frame-Options: DENY < Strict-Transport-Security: max-age=604800 < Expires: Tue, 31 Oct 2017 12:50:41 GMT < Cache-Control: max-age=0, no-cache, no-store < Pragma: no-cache < Date: Tue, 31 Oct 2017 12:50:41 GMT < Connection: keep-alive < { "Mu5EZq4sF-A": "https://community.letsencrypt.org/t/adding-random-entries-to-the-directory/33417", "key-change": "https://acme-v01.api.letsencrypt.org/acme/key-change", "meta": { "terms-of-service": "https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf" }, "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", "revoke-cert": "https://acme-v01.api.letsencrypt.org/acme/revoke-cert" * Connection #0 to host acme-v01.api.letsencrypt.org left intact }