511 Network Authentication Required
5xx Server Error
RFC 6585
You need to log into the network before you can browse.
What 511 Network Authentication Required means {#what}
The client needs to authenticate with the network itself — not the web server. Classic captive portal scenario: hotel WiFi, airport lounge, corporate network that requires accepting terms before granting internet access. The response should include a link to the login page.
When you’ll see a 511 {#when}
- Hotel, airport, or coffee shop WiFi login screens
- Corporate network access control