Let's Debug

Test result for sesstim4.timone.univ-amu.fr using http-01

Error
sesstim4.timone.univ-amu.fr has an A (IPv4) record (139.124.158.220) but a request to this address over port 80 did not succeed. Your web server must have at least one working IPv4 or IPv6 address.
Get "http://sesstim4.timone.univ-amu.fr/.well-known/acme-challenge/letsdebug-test": read tcp 172.104.24.29:36006->139.124.158.220:80: read: connection reset by peer

Trace:
@0ms: Making a request to http://sesstim4.timone.univ-amu.fr/.well-known/acme-challenge/letsdebug-test (using initial IP 139.124.158.220)
@0ms: Dialing 139.124.158.220
@1198ms: Experienced error: read tcp 172.104.24.29:36006->139.124.158.220:80: read: connection reset by peer
A test authorization for sesstim4.timone.univ-amu.fr to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
139.124.158.220: Fetching http://sesstim4.timone.univ-amu.fr/.well-known/acme-challenge/UUOPrMZMnLilOvDrVIoVP8svITn_-hAhe87Q9xIdQqg: Connection reset by peer

Submitted Nov 15 03:07:49 2023. Sat in queue for 3ms. Completed in 21s. Show verbose information.