hwsn-asp-transfer02.slm.bz has an A (IPv4) record (185.248.250.187) 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.
A timeout was experienced while communicating with hwsn-asp-transfer02.slm.bz/185.248.250.187: Get "http://hwsn-asp-transfer02.slm.bz/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
Trace:
@0ms: Making a request to http://hwsn-asp-transfer02.slm.bz/.well-known/acme-challenge/letsdebug-test (using initial IP 185.248.250.187)
@0ms: Dialing 185.248.250.187
@10000ms: Experienced error: context deadline exceeded
A test authorization for hwsn-asp-transfer02.slm.bz to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
185.248.250.187: Fetching http://hwsn-asp-transfer02.slm.bz/.well-known/acme-challenge/CT_HM6PJoGb2TBG42EfDGexHLQYqfQ9q5TbEy7Lmtc4: Timeout during connect (likely firewall problem)