nextcloud.vanregteren.net has an A (IPv4) record (84.245.10.94) 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 nextcloud.vanregteren.net/84.245.10.94: Get "http://nextcloud.vanregteren.net/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
Trace:
@0ms: Making a request to http://nextcloud.vanregteren.net/.well-known/acme-challenge/letsdebug-test (using initial IP 84.245.10.94)
@0ms: Dialing 84.245.10.94
@10000ms: Experienced error: context deadline exceeded
A test authorization for nextcloud.vanregteren.net to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
84.245.10.94: Fetching http://nextcloud.vanregteren.net/.well-known/acme-challenge/KX_5SQcfRXO-Ja2IVHFEWFcSkMEMHlsw0Cc-HFLiJYo: Timeout during connect (likely firewall problem)