A test authorization for cadrewiki.rangerhq.net to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
75.149.60.248: Fetching http://cadrewiki.rangerhq.net/.well-known/acme-challenge/_sxNJhrvwmXvpNMWdWYRP1PWBNJoRZD3tET9QYRS1Zo: Timeout during connect (likely firewall problem)