Let's Debug

Test result for w3.dmat.ufrr.br using http-01

Error
w3.dmat.ufrr.br has an A (IPv4) record (200.129.159.22) 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://w3.dmat.ufrr.br/.well-known/acme-challenge/letsdebug-test": read tcp 172.104.24.29:34046->200.129.159.22:80: read: connection reset by peer

Trace:
@0ms: Making a request to http://w3.dmat.ufrr.br/.well-known/acme-challenge/letsdebug-test (using initial IP 200.129.159.22)
@0ms: Dialing 200.129.159.22
@319ms: Experienced error: read tcp 172.104.24.29:34046->200.129.159.22:80: read: connection reset by peer
A test authorization for w3.dmat.ufrr.br to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
200.129.159.22: Fetching http://w3.dmat.ufrr.br/.well-known/acme-challenge/ncKuuvTL7lEbkjJ_jBSeIl8AHRLtyqgSno5rY1107Hc: Connection reset by peer

Submitted Jan 30 21:14:47 2023. Sat in queue for 2ms. Completed in 7s. Show verbose information.