euat.udc.es has an A (IPv4) record (193.144.61.119) 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://euat.udc.es/.well-known/acme-challenge/letsdebug-test": read tcp 172.104.24.29:46430->193.144.61.119:80: read: connection reset by peer
Trace:
@0ms: Making a request to http://euat.udc.es/.well-known/acme-challenge/letsdebug-test (using initial IP 193.144.61.119)
@0ms: Dialing 193.144.61.119
@233ms: Experienced error: read tcp 172.104.24.29:46430->193.144.61.119:80: read: connection reset by peer
A test authorization for euat.udc.es to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
193.144.61.119: Fetching http://euat.udc.es/.well-known/acme-challenge/SE8PKYfDg3zqdtzNuNW529OjX4PZBQJp7HGrjSm7_sQ: Connection reset by peer