511511 Network Authentication Required
The client needs to authenticate to gain network access, typically for captive portals.
What causes this error
You are behind a captive portal (hotel WiFi, airport, corporate network) that requires login before granting internet access. The network intercepts your request and returns this status.
How to fix it
Open a browser and navigate to any HTTP page to trigger the captive portal login. Complete the authentication process. After logging in, retry your original request.
Related Error Codes
521521 Web Server Is Down
The origin web server has refused the connection from Cloudflare.
226226 IM Used
The server has fulfilled a GET request and the response is a representation of the result of one or more instance-manipulations applied to the current instance.
204204 No Content
The server successfully processed the request but is not returning any content in the response body.
207207 Multi-Status
The response provides status for multiple independent operations in a single response (WebDAV).
411411 Length Required
The server requires a Content-Length header in the request but none was provided.
507507 Insufficient Storage
The server cannot store the representation needed to complete the request (WebDAV).