gentecho.com has multiple IP addresses in its DNS records. While they 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 some of the IP addresses may unintentionally point to different servers, which would cause validation to fail.
[Address=2606:50c0:8003::153,Address Type=IPv6,Server=GitHub.com,HTTP Status=404] vs [Address=139.59.52.164,Address Type=IPv4,Server=nginx/1.22.0 (Ubuntu),HTTP Status=404]
Requests made to the domain
Request to: gentecho.com/2606:50c0:8003::153, Result: [Address=2606:50c0:8003::153,Address Type=IPv6,Server=GitHub.com,HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://gentecho.com/.well-known/acme-challenge/letsdebug-test (using initial IP 2606:50c0:8003::153)
@0ms: Dialing 2606:50c0:8003::153
@21ms: Server response: HTTP 404 Not Found
Request to: gentecho.com/2606:50c0:8001::153, Result: [Address=2606:50c0:8001::153,Address Type=IPv6,Server=GitHub.com,HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://gentecho.com/.well-known/acme-challenge/letsdebug-test (using initial IP 2606:50c0:8001::153)
@0ms: Dialing 2606:50c0:8001::153
@6ms: Server response: HTTP 404 Not Found
Request to: gentecho.com/2606:50c0:8000::153, Result: [Address=2606:50c0:8000::153,Address Type=IPv6,Server=GitHub.com,HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://gentecho.com/.well-known/acme-challenge/letsdebug-test (using initial IP 2606:50c0:8000::153)
@0ms: Dialing 2606:50c0:8000::153
@5ms: Server response: HTTP 404 Not Found
Request to: gentecho.com/2606:50c0:8002::153, Result: [Address=2606:50c0:8002::153,Address Type=IPv6,Server=GitHub.com,HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://gentecho.com/.well-known/acme-challenge/letsdebug-test (using initial IP 2606:50c0:8002::153)
@0ms: Dialing 2606:50c0:8002::153
@5ms: Server response: HTTP 404 Not Found
Request to: gentecho.com/139.59.52.164, Result: [Address=139.59.52.164,Address Type=IPv4,Server=nginx/1.22.0 (Ubuntu),HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://gentecho.com/.well-known/acme-challenge/letsdebug-test (using initial IP 139.59.52.164)
@0ms: Dialing 139.59.52.164
@476ms: Server response: HTTP 404 Not Found
A and AAAA records found for this domain
gentecho.com. 0 IN A 139.59.52.164
gentecho.com. 0 IN AAAA 2606:50c0:8003::153
gentecho.com. 0 IN AAAA 2606:50c0:8001::153
gentecho.com. 0 IN AAAA 2606:50c0:8000::153
gentecho.com. 0 IN AAAA 2606:50c0:8002::153
Challenge update failures for gentecho.com in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/9133257414
acme: error code 403 "urn:ietf:params:acme:error:unauthorized": 2606:50c0:8002::153: Invalid response from http://gentecho.com/.well-known/acme-challenge/uDeTz_9Cr1vLtxtnWH4xHRhH5IWZrc6oGwsriLltAAg: 404