The domain cf-no-ssl.fleetssl.com is being served through Cloudflare CDN. Any Let's Encrypt certificate installed on the origin server will only encrypt traffic between the server and Cloudflare. It is strongly recommended that the SSL option 'Full SSL (strict)' be enabled.
https://support.cloudflare.com/hc/en-us/articles/200170416-What-do-the-SSL-options-mean-
The domain cf-no-ssl.fleetssl.com is being served through Cloudflare CDN and a certificate has not yet been provisioned yet by Cloudflare.
https://support.cloudflare.com/hc/en-us/articles/203045244-How-long-does-it-take-for-Cloudflare-s-SSL-to-activate-
CAA records control authorization for certificate authorities to issue certificates for a domain
fleetssl.com. 0 IN CAA 0 issue "letsencrypt.org"
fleetssl.com. 0 IN CAA 0 issuewild ";"
Requests made to the domain
Request to: cf-no-ssl.fleetssl.com/2400:cb00:2048:1::681f:5c36, Result: [Address Type=IPv6,Server=cloudflare,HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://cf-no-ssl.fleetssl.com/.well-known/acme-challenge/letsdebug-test (using initial IP 2400:cb00:2048:1::681f:5c36)
@0ms: Dialing 2400:cb00:2048:1::681f:5c36
@641ms: Server response: HTTP 404 404 Not Found
Request to: cf-no-ssl.fleetssl.com/2400:cb00:2048:1::681f:5d36, Result: [Address Type=IPv6,Server=cloudflare,HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://cf-no-ssl.fleetssl.com/.well-known/acme-challenge/letsdebug-test (using initial IP 2400:cb00:2048:1::681f:5d36)
@0ms: Dialing 2400:cb00:2048:1::681f:5d36
@322ms: Server response: HTTP 404 404 Not Found
Request to: cf-no-ssl.fleetssl.com/104.31.93.54, Result: [Address Type=IPv4,Server=cloudflare,HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://cf-no-ssl.fleetssl.com/.well-known/acme-challenge/letsdebug-test (using initial IP 104.31.93.54)
@0ms: Dialing 104.31.93.54
@621ms: Server response: HTTP 404 404 Not Found
Request to: cf-no-ssl.fleetssl.com/104.31.92.54, Result: [Address Type=IPv4,Server=cloudflare,HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://cf-no-ssl.fleetssl.com/.well-known/acme-challenge/letsdebug-test (using initial IP 104.31.92.54)
@0ms: Dialing 104.31.92.54
@620ms: Server response: HTTP 404 404 Not Found
A and AAAA records found for this domain
cf-no-ssl.fleetssl.com. 0 IN A 104.31.93.54
cf-no-ssl.fleetssl.com. 0 IN A 104.31.92.54
cf-no-ssl.fleetssl.com. 0 IN AAAA 2400:cb00:2048:1::681f:5c36
cf-no-ssl.fleetssl.com. 0 IN AAAA 2400:cb00:2048:1::681f:5d36
Challenge update failures for cf-no-ssl.fleetssl.com in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/1230163
acme: error code 403 "urn:ietf:params:acme:error:unauthorized": Invalid response from http://cf-no-ssl.fleetssl.com/.well-known/acme-challenge/neLaUn1raNSArFXvWy4RO2AxpzJNRu3Wx5qT_9OY5Mw: "<html>
<head><title>404 Not Found</title></head>
<body bgcolor="white">
<center><h1>404 Not Found</h1></center>
<hr><center>"
The IANA public suffix is the TLD of the Registered Domain
The TLD for cf-no-ssl.fleetssl.com is: com
Certificates contributing to rate limits for this domain
Serial: 387211899817643861071831758475492505547860
NotBefore: 2018-05-23 09:21:16 +0000 UTC
Names: [fleetssl.com www.fleetssl.com]
Serial: 321200841972270827084903448690251779042553
NotBefore: 2018-05-20 22:32:55 +0000 UTC
Names: [plugindev.fleetssl.com]
The current status.io status for Let's Encrypt
Operational