A test authorization for aks-amt.alfing.de to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
2001:67c:2378:8015::156: Fetching https://www.aks-amt.alfing.de/en/page-not-found.html: received disallowed redirect status code
aks-amt.alfing.de 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=2001:67c:2378:8015::156,Address Type=IPv6,Server=Apache/2.2.15 (CentOS),HTTP Status=301,Number of Redirects=2,Final HTTP Status=200] vs [Address=3.74.177.42,Address Type=IPv4,Server=nginx,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404]
Requests made to the domain
Request to: aks-amt.alfing.de/2001:67c:2378:8015::156, Result: [Address=2001:67c:2378:8015::156,Address Type=IPv6,Server=Apache/2.2.15 (CentOS),HTTP Status=301,Number of Redirects=2,Final HTTP Status=200], Issue:
Trace:
@0ms: Making a request to http://aks-amt.alfing.de/.well-known/acme-challenge/letsdebug-test (using initial IP 2001:67c:2378:8015::156)
@0ms: Dialing 2001:67c:2378:8015::156
@200ms: Server response: HTTP 301 Moved Permanently
@200ms: Received redirect to https://www.aks-amt.alfing.de/.well-known/acme-challenge/letsdebug-test
@1799ms: Dialing 2001:67c:2378:8015::156
@2241ms: Server response: HTTP 303 See Other
@2241ms: Received redirect to https://www.aks-amt.alfing.de/en/page-not-found.html
@2241ms: Dialing 2001:67c:2378:8015::156
@2886ms: Server response: HTTP 200 OK
Request to: aks-amt.alfing.de/3.74.177.42, Result: [Address=3.74.177.42,Address Type=IPv4,Server=nginx,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://aks-amt.alfing.de/.well-known/acme-challenge/letsdebug-test (using initial IP 3.74.177.42)
@0ms: Dialing 3.74.177.42
@175ms: Server response: HTTP 301 Moved Permanently
@175ms: Received redirect to https://aks-amt.alfing.de/.well-known/acme-challenge/letsdebug-test
@175ms: Dialing 3.74.177.42
@446ms: Server response: HTTP 404 Not Found
A and AAAA records found for this domain
aks-amt.alfing.de. 0 IN A 3.74.177.42
aks-amt.alfing.de. 0 IN AAAA 2001:67c:2378:8015::156
Challenge update failures for aks-amt.alfing.de in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/5643168144
acme: error code 400 "urn:ietf:params:acme:error:connection": 2001:67c:2378:8015::156: Fetching https://www.aks-amt.alfing.de/en/page-not-found.html: received disallowed redirect status code
The IANA public suffix is the TLD of the Registered Domain
The TLD for aks-amt.alfing.de is: de
The current status.io status for Let's Encrypt
Operational