HTTP 511 Network Authentication Required

Status code 511 · Class 5xx

HTTP

Network Authentication Required

HTTP request chain from browser through CDN and proxy to the origin server
HTTP errors: find which hop in the request chain failed and read its logs.

What it means

HTTP_511 is a HTTP error code reported by web servers and HTTP clients. Its official message is: “Network Authentication Required”

How to fix HTTP 511 Network Authentication Required

  1. It is (almost certainly) server-side: check the origin application logs and error tracker
  2. Test origin directly (bypass CDN/proxy) to separate infra from application errors
  3. If behind a CDN: purge the cache and verify the origin's health status

Related errors

HTTP 504 Gateway TimeoutHTTP 510 Not Extended (OBSOLETED)HTTP 508 Loop DetectedHTTP 403 ForbiddenHTTP 404 Not FoundHTTP 405 Method Not AllowedHTTP 408 Request TimeoutHTTP 409 Conflict

Source: IANA HTTP Status Code Registry

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