I'm having the same problem here. No success with the splunk_httpinput trick. I got this on the splunkd.log:
07-22-2016 11:45:26.361 -0300 WARN IConfCache - Error populating shared UserConfCache state: inputs /opt/splunk/etc/deployment-apps
07-22-2016 11:45:26.427 -0300 FATAL DeploymentServer - Attempted operation on uninitialized instance.
07-22-2016 11:45:26.427 -0300 ERROR DeploymentServer - Deployment Server is not available, because errors prevented its initialization. Please consult splunkd.log for details. You can try to reload Deployment Server after correcting these errors.
And some other logs/errors on web_service.log (Python tracebacks).
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