I would suggest you to inspect the log files, maybe there you can find the problem.
- Path to log: C:\Program Data\Qlik\Sense\Log
It sounds like a configuration or permission issue.
I noticed you put twice the same question here and in your status update. Since here is the correct place to report this kind of problem, remove it from the your state update, I'll report here again my reply
You're trying to connect on 127.0.0.1. Replace the loop back IP address with the server name (the one you used during the installation process)
Alternatively you can put the 127.0.0.1 in the whitelist in the Proxy settings