hwsn-asp-transfer02.slm.bz has an A (IPv4) record (18.104.22.168) 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/22.214.171.124: Get "http://hwsn-asp-transfer02.slm.bz/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
@0ms: Making a request to http://hwsn-asp-transfer02.slm.bz/.well-known/acme-challenge/letsdebug-test (using initial IP 126.96.36.199)
@0ms: Dialing 188.8.131.52
@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.
184.108.40.206: Fetching http://hwsn-asp-transfer02.slm.bz/.well-known/acme-challenge/kUKokkxvu6-GZc6TmNlGO_vrdtDP-w6rQpEmCmb75fk: Timeout during connect (likely firewall problem)