Problem Description I'm getting a DisallowedHost error in my Django production environment, even though the domain is clearly listed in my ALLOWED_HOSTS setting. I am using traefik. Error Message: django.core.exceptions.DisallowedHost: Invalid HTTP_HOST header: 'api.tuitionwave.com'. You may need to add 'api.tuitionwave.com' to ALLOWED_HOSTS. Current Configuration: My production.py settings file includes: ALLOWED_HOSTS configuration ALLOWED_HOSTS = ["api.tuitionwave.com", "localhost", "127.0.0.1", "django"] # Trust proxy headers USE_X_FORWARDED_HOST = True USE_X_FORWARDED_PORT = True # Security settings SECURE_PROXY_SSL_HEADER = ("HTTP_X_FORWARDED_PROTO", "https") SECURE_SSL_REDIRECT = env.bool("DJANGO_SECURE_SSL_REDIRECT", default=True) What I've Tried Verified that api.tuitionwave.com is explicitly listed in ALLOWED_HOSTS List item Confirmed the settings file is being loaded correctly Checked that there are no whitespace issues in the domain name And here is my traefik.yml File details http: routers: web-router: rule: "Host(`api.tuitionwave.com`)" entryPoints: - web middlewares: - redirect service: django web-secure-router: rule: "Host(`api.tuitionwave.com`)" entryPoints: - web-secure middlewares: - default-headers service: django tls: # https://docs.traefik.io/master/routing/routers/#certresolver certResolver: letsencrypt Continue reading...