Let's Debug

Test result for www.tech-check.ch using http-01

A test authorization for www.tech-check.ch to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://www.tech-check.ch/.well-known/acme-challenge/j1KL3GpmnVTAd7JKNF9am1tTOFsl-nPfqmo0_taFBrA: Connection refused
Debug
Requests made to the domain
Request to: www.tech-check.ch/94.231.94.122, Result: [Address Type=IPv4,Server=nginx,HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://www.tech-check.ch/.well-known/acme-challenge/letsdebug-test (using initial IP 94.231.94.122)
@0ms: Dialing 94.231.94.122
@218ms: Server response: HTTP 404 Not Found

Debug
A and AAAA records found for this domain
www.tech-check.ch. 0 IN A 94.231.94.122
Challenge update failures for www.tech-check.ch in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/7970525
acme: error code 400 "urn:ietf:params:acme:error:connection": Fetching http://www.tech-check.ch/.well-known/acme-challenge/j1KL3GpmnVTAd7JKNF9am1tTOFsl-nPfqmo0_taFBrA: Connection refused
Debug
The IANA public suffix is the TLD of the Registered Domain
The TLD for www.tech-check.ch is: ch
Debug
The current status.io status for Let's Encrypt
Operational

Submitted Sep 13 08:23:40 2018. Sat in queue for 4ms. Completed in 4s. Hide verbose information.