sybestreaming.ch has an A (IPv4) record (170.17.155.156) 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://sybestreaming.ch/.well-known/acme-challenge/letsdebug-test": dial tcp 170.17.155.156:80: connect: connection refused
Trace:
@0ms: Making a request to http://sybestreaming.ch/.well-known/acme-challenge/letsdebug-test (using initial IP 170.17.155.156)
@0ms: Dialing 170.17.155.156
@82ms: Experienced error: dial tcp 170.17.155.156:80: connect: connection refused
A test authorization for sybestreaming.ch to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
170.17.155.156: Fetching http://sybestreaming.ch/.well-known/acme-challenge/2Ikchj3kx7zojK_T9e5SqMfgdpZStQZyQ6kGvg0fJys: Connection refused