blog.salimhome.de has an A (IPv4) record (217.160.251.6) 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 "https://blog.salimhome.de/.well-known/acme-challenge/letsdebug-test": EOF
Trace:
@0ms: Making a request to http://blog.salimhome.de/.well-known/acme-challenge/letsdebug-test (using initial IP 217.160.251.6)
@0ms: Dialing 217.160.251.6
@184ms: Server response: HTTP 301 Moved Permanently
@184ms: Received redirect to https://blog.salimhome.de/.well-known/acme-challenge/letsdebug-test
@184ms: Dialing 217.160.251.6
@371ms: Experienced error: EOF
A test authorization for blog.salimhome.de to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching https://blog.salimhome.de/.well-known/acme-challenge/ISjuIXVtiYLClmxW9l0JzPrdF2P6OSjK9_bcpruenaw: Connection reset by peer