stefanmarcin.sk has an A (IPv4) record (85.216.136.150) 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 stefanmarcin.sk/85.216.136.150: Get "http://stefanmarcin.sk/.well-known/acme-challenge/letsdebug-test": dial tcp 85.216.136.150:80: i/o timeout
Trace:
@0ms: Making a request to http://stefanmarcin.sk/.well-known/acme-challenge/letsdebug-test (using initial IP 85.216.136.150)
@0ms: Dialing 85.216.136.150
@10000ms: Experienced error: dial tcp 85.216.136.150:80: i/o timeout
A test authorization for stefanmarcin.sk to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://stefanmarcin.sk/.well-known/acme-challenge/0zAIMPvWWYH_h3Z_nFsFbASJ1ThYv44eveKde3NgX6U: Timeout during connect (likely firewall problem)
The current status as reported by the Let's Encrypt status page is Degraded Performance as at 2021-03-07 07:39:32.586 +0000 UTC. Depending on the reported problem, this may affect certificate issuance. For more information, please visit the status page.
https://letsencrypt.status.io/