Nginx 444 No Response

Plain-English meaning

Nginx intentionally closes connection without an HTTP response body.

Used to drop unwanted traffic, but can also block legitimate traffic when misconfigured.

Search configs for return 444 directives and confirm Host/SNI values for affected requests.

Narrow blocking rules, add explicit allow rules for valid hosts, and isolate security drop logic from app routes.

server { if ($host !~* ^api\.example\.com$) { return 444; } }