Kong Api Gateway Issue

Am exploring the Kong Api Gateway capabilities.
I have configured service, route with anonymous access exactly following the instructions in the link below.

failed",“mockbin.org.company.com:5 - cache only lookup failed/dns server error: 100 cache only lookup failed”] while connecting to upstream, client: 127.0.0.1, server: kong, request: “GET /auth-sample HTTP/1.1”, upstream: “http://104.21.60.227:80/request”, host: “localhost:8000”