Articles/HTTP

HTTP 511 Network Authentication Required — What It Means

What HTTP status code 511 Network Authentication Required means, when servers return it, and how to handle it correctly.

Published September 26, 2026

HTTP 511 Network Authentication Required — The client needs to authenticate to gain network access.

Key points

  • Commonly seen on public WiFi networks requiring login through a captive portal before granting internet access
  • Returned by the network infrastructure itself, not the actual destination server
  • The response typically includes a link to the authentication page
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