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 172.104.24.29:49274->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
@303ms: Experienced error: read tcp 172.104.24.29:49274->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/aoxAE0w7qHSJcVaxTQ0FkyALDtN1CkmGG8tVNvHtN_c: Connection reset by peer
w3.dmat.ufrr.br is currently affected by Let's Encrypt-based rate limits (https://letsencrypt.org/docs/rate-limits/). You may review certificates that have already been issued by visiting https://crt.sh/?q=%ufrr.br . Please note that it is not possible to ask for a rate limit to be manually cleared.
The 'Certificates per Registered Domain' limit (50 certificates per week that share the same Registered Domain: ufrr.br) has been exceeded. There is no way to work around this rate limit. The next non-renewal certificate for this Registered Domain should be issuable after 2023-02-01 17:18:46 +0000 UTC (38h55m0s from now).