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": context deadline exceeded
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: context deadline exceeded
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/KsYqD08UvcoCOgSb3eYs8qALckGsXjnGE1ShSwzScgM: Timeout during connect (likely firewall problem)