gunicorn.errors.HaltServer: <HaltServer 'Worker failed to boot.' 3> django

run guncorn with --preload can see the error log, like this

gunicorn app:application --preload -b 0.0.0.0:5000 

This will usually give you a more detailed error message.

Actually the problem here was the wsgi file itself, previously before django 1.3 the wsgi file was named with an extension of .wsgi, but now in the recent versions it will be created with and extension of .py that is the wsgi file must be a python module

so the file should be hello_wsgi.py and command should be

gunicorn  hello:application -b xx.xxx.xxx.xx:8000