[Answered ]-Mis-setting django's ALLOWED_HOSTS setting does not give understandable errors

Yes, Django error logs.

[ERROR] [2014-10-23 12:46:06,073] [base 6808 140062533326784] [Invalid HTTP_HOST header: 'whatver.host'.You may need to add u'whatever_host' to ALLOWED_HOSTS.]

Here’s an example log config. you should be logging Djanogo errors if you hope to debug anything.

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'handlers': {
        'error_file': {
            'level': 'ERROR',
            'filename': os.path.join(LOG_PATH, 'error.log'),
            'class':'logging.handlers.RotatingFileHandler',
            'maxBytes': 1 * 1024 * 1024,
            'backupCount': 2
        }
    },
    'loggers': {
        'django': {
            'handlers': ['error_file'],
            'level': 'ERROR',
            'propagate': True
        }
    }
}