I'm asking about an error I've got a few times in the past day, outside of the theoretical. I'm wondering what may be actually happening in my case.
The error comes from Sentry, on my ubuntu/nginx/uwsgi/Django via AWS Elastic Beanstalk stack:
Invalid HTTP_HOST header: '126.96.36.199'. You may need to add u'188.8.131.52' to ALLOWED_HOSTS.
Exception while resolving variable 'exception_type' in template 'unknown'.
184.108.40.206 is associated with
scan-15.shadowserver.org. ALLOWED_HOSTS is there to prevent the HTTP host header attacks.
Should I be concerned? What is going on here in concrete terms?