status Registered
Verified 2026-09-18 · registry updated
2025-09-15HTTP 511 Network Authentication Required
The client must authenticate to gain network access through an intercepting network intermediary.
Use 511 for captive portals or network access control, not ordinary origin-server application login.
httpstatus codenetworkauth
Response (http)
HTTP/1.1 511 Network Authentication Required
Use 511 for captive portals or network access control, not ordinary origin-server application login.
Common mistakes
- Using 511 for application login; it is for captive-portal network authentication only.
Registry reference: rfc6585