This is caused by the fact, that the you have a misconfigured DNS in your Cloud Foundry VMs. You can check your api and api_worker logs for:
{"timestamp":1437768720.976319,"message":"Request failed: 500: {"code"=>10001, "description"=>"getaddrinfo: Name or service not known (https://hm9000.X.Y.Z.W.xip.io:443)", "...}
errors and should afterwards take a look into the /etc/resolv.conf and check your DNS settings.