Let's Debug

Test result for www.howdesignlive.com using http-01

www.howdesignlive.com has both AAAA (IPv6) and A (IPv4) records. While they both appear to be accessible on the network, we have detected that they produce differing results when sent an ACME HTTP validation request. This may indicate that the IPv4 and IPv6 addresses may unintentionally point to different servers, which would cause validation to fail.
[Address Type=IPv4,Server=Apache/2.4.18 (Ubuntu),HTTP Status=404] vs [Address Type=IPv6,Server=Apache,HTTP Status=404]
Debug
Requests made to the domain
Request to: www.howdesignlive.com/2607:f1c0:1000:10c8:eb97:1088:8d80:304c, Result: [Address Type=IPv6,Server=Apache,HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://www.howdesignlive.com/.well-known/acme-challenge/letsdebug-test (using initial IP 2607:f1c0:1000:10c8:eb97:1088:8d80:304c)
@0ms: Dialing 2607:f1c0:1000:10c8:eb97:1088:8d80:304c
@1540ms: Server response: HTTP 404 Not Found

Request to: www.howdesignlive.com/138.197.20.176, Result: [Address Type=IPv4,Server=Apache/2.4.18 (Ubuntu),HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://www.howdesignlive.com/.well-known/acme-challenge/letsdebug-test (using initial IP 138.197.20.176)
@0ms: Dialing 138.197.20.176
@147ms: Server response: HTTP 404 Not Found

Debug
A and AAAA records found for this domain
www.howdesignlive.com. 0 IN A 138.197.20.176
www.howdesignlive.com. 0 IN AAAA 2607:f1c0:1000:10c8:eb97:1088:8d80:304c
Challenge update failures for www.howdesignlive.com in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/9167987
acme: error code 403 "urn:ietf:params:acme:error:unauthorized": Invalid response from http://www.howdesignlive.com/.well-known/acme-challenge/eGsbZI8dO8GYVTya1FmtHiFR6RrTnQnHOIIhkdyW2fE: "<!DOCTYPE html>\r\n<html lang=\"en\">\r\n<!--[if lt IE 7]><html lang=\"en-US\" class=\"no-js lt-ie9 lt-ie8 lt-ie7\"><![endif]-->\r\n<!--[if "
Debug
The IANA public suffix is the TLD of the Registered Domain
The TLD for www.howdesignlive.com is: com
Debug
The current status.io status for Let's Encrypt
Operational

Submitted Sep 28 15:43:28 2018. Sat in queue for 1ms. Completed in 4s. Hide verbose information.