HTTP 511 Network Authentication Required Error - Meaning & Fix

The HTTP 511 Network Authentication Required status code indicates that you need to authenticate to access the network. This requirement is typically set by network proxies, not the original server. In the context of web scraping, this error can occur when a scraper attempts to access a website or resource behind a network gateway or proxy that requires authentication (e.g., login credentials, agreeing to terms, or solving a CAPTCHA) before the scraper can proceed with making requests.

Main causes

Client device has not authenticated with the network using required credentials.
Terms and conditions of network access have not been accepted by the user.
User interaction required for network access has not been completed.
MAC address of the client device is not recognized or authorized by the network system.

# Request example 
curl -X GET https://sandbox.oxylabs.io/ -H 'Accept: text/html' -H 'Accept-Encoding: compress' -H 'User-Agent: AppleWebKit/537.36'

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Common fixes

Check if the network requires registration or acceptance of terms and complete the necessary steps.
Ensure your device is properly connected to the network that requires authentication.
Update your browser or network client to the latest version to support required authentication protocols.
Contact the network administrator for guidance on how to authenticate or resolve connectivity issues.

# Response example HTTP/1.1 511 Network Authentication Required Content-Type: text/html Content-Encoding: compress 511 Network Authentication Required

Network Authentication Required

You need to authenticate to access this network.

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Common scraping HTTP error codes

401 Unauthorized	403 Forbidden	404 Not found	405 Method not allowed	406 Not acceptable
407 Proxy authentication required	408 Request timeout	409 Conflict	410 Gone	411 Length required
412 Precondition failed	413 Payload too large	414 Uri too long	415 Unsupported media type	416 Range not satisfiable
417 Expectation failed	421 Misdirected request	422 Unprocessable entity	423 Locked	424 Failed dependency
426 Upgrade required	428 Precondition required	429 Too many requests	431 Request header fields too large	444 Connection: close
451 Unavailable for legal reasons	499 Client closed request	501 Not implemented	503 Service unavailable	505 Http version not supported
506 Variant also negotiates	507 Insufficient storage	508 Loop detected	510 Not extended	511 Network authentication required