I am having the same problem cannot open 127.0.0.1:8000 Web Admin Page
very frustrating as I installed the 2.1 sandbox on VirtualBox same problem and downloaded and installed VM Ware version and still the same issue.
Can you help? is the a bug with the Hortonworks build?
Thinking to try Cloudera now unless this is sorted?
I am running windows 8.1.