Sending an ACME HTTP validation request to lyceefermat.zapto.org results in an unacceptable redirect. This is most likely a misconfiguration of your web server or your web application.
Bad port number provided when fetching http://fermat.zapto.org:8080/fermat/Fermat//.well-known/acme-challenge/letsdebug-test: 8080
Trace:
@0ms: Making a request to http://lyceefermat.zapto.org/.well-known/acme-challenge/letsdebug-test (using initial IP 34.199.8.144)
@0ms: Dialing 34.199.8.144
@20ms: Server response: HTTP 302 Found
@20ms: Received redirect to http://fermat.zapto.org:8080/fermat/Fermat//.well-known/acme-challenge/letsdebug-test
A test authorization for lyceefermat.zapto.org to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
34.199.8.144: Fetching http://fermat.zapto.org:8080/fermat/Fermat//.well-known/acme-challenge/9lAAg4ut9lso7EDrXsrXs7aB-SIeAp7ZhqhvRVEZNLI: Invalid port in redirect target. Only ports 80 and 443 are supported, not 8080