bbb.mahale-ggmbh.de has an A (IPv4) record (45.146.254.209) 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://bbb.mahale-ggmbh.de/.well-known/acme-challenge/letsdebug-test": read tcp 172.104.24.29:52712->45.146.254.209:80: read: connection reset by peer
Trace:
@0ms: Making a request to http://bbb.mahale-ggmbh.de/.well-known/acme-challenge/letsdebug-test (using initial IP 45.146.254.209)
@0ms: Dialing 45.146.254.209
@160ms: Experienced error: read tcp 172.104.24.29:52712->45.146.254.209:80: read: connection reset by peer
A test authorization for bbb.mahale-ggmbh.de to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
45.146.254.209: Fetching http://bbb.mahale-ggmbh.de/.well-known/acme-challenge/OOwTVyC7sKBRog7tr2QICgSKsORS4o1Y0QdcUZmB8dg: Connection reset by peer