owncloud-viz.ddns.net has an A (IPv4) record (99.237.77.62) 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://owncloud-viz.ddns.net/.well-known/acme-challenge/letsdebug-test": dial tcp 99.237.77.62:80: connect: no route to host
Trace:
@0ms: Making a request to http://owncloud-viz.ddns.net/.well-known/acme-challenge/letsdebug-test (using initial IP 99.237.77.62)
@0ms: Dialing 99.237.77.62
@3088ms: Experienced error: dial tcp 99.237.77.62:80: connect: no route to host
A test authorization for owncloud-viz.ddns.net to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
99.237.77.62: Fetching http://owncloud-viz.ddns.net/.well-known/acme-challenge/5HfEcpaFHfWLHacuv3ybDuRX1v4BOFMIj_66hJDFOu4: Error getting validation data