A validation request to this domain resulted in an HTTP request being made to a port that expects to receive HTTPS requests. This could be the result of an incorrect redirect (such as to http://example.com:443/) or it could be the result of a webserver misconfiguration, such as trying to enable SSL on a port 80 virtualhost.
@0ms: Making a request to http://app01.mueleh.ch/.well-known/acme-challenge/letsdebug-test (using initial IP 91.138.73.114)
@0ms: Dialing 91.138.73.114
@200ms: Server response: HTTP 400 Bad Request
Requests made to the domain
Request to: app01.mueleh.ch/91.138.73.114, Result: [Address=91.138.73.114,Address Type=IPv4,Server=Apache/2.4.52 (Ubuntu),HTTP Status=400], Issue:
Trace:
@0ms: Making a request to http://app01.mueleh.ch/.well-known/acme-challenge/letsdebug-test (using initial IP 91.138.73.114)
@0ms: Dialing 91.138.73.114
@200ms: Server response: HTTP 400 Bad Request
A and AAAA records found for this domain
app01.mueleh.ch. 0 IN A 91.138.73.114
Challenge update failures for app01.mueleh.ch in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/6625576963
acme: error code 403 "urn:ietf:params:acme:error:unauthorized": 91.138.73.114: Invalid response from http://app01.mueleh.ch/.well-known/acme-challenge/eqspMKcEjRRP1H9TuSZfczcN6qD8PyCG7YPQFKluEdc: 400
The IANA public suffix is the TLD of the Registered Domain
The TLD for app01.mueleh.ch is: ch
5 Certificates contributing to rate limits for this domain
Serial: 377911390276344141729904416890505349972854
NotBefore: 2023-01-17 18:19:28 +0000 UTC
Names: [wac.mueleh.ch]
Serial: 320510247372853400796157304561139975604983
NotBefore: 2023-01-15 12:02:24 +0000 UTC
Names: [ipam.mueleh.ch]
Serial: 319828149577821824070704959024440290410479
NotBefore: 2023-01-14 21:15:52 +0000 UTC
Names: [search.mueleh.ch]
Serial: 321788055762325299395769033198744215231916
NotBefore: 2023-01-14 20:32:55 +0000 UTC
Names: [rdg.mueleh.ch]
Serial: 400794084409665556113505902194791640001526
NotBefore: 2023-01-14 20:32:24 +0000 UTC
Names: [search.mueleh.ch]
The current status.io status for Let's Encrypt
Operational