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: compress511 Network Authentication Required Network Authentication Required
You need to authenticate to access this network.
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