What it means

A 511 Network Authentication Required response indicates the client needs to authenticate to gain network access. This is often used by captive portals at hotels, airports, or coffee shops to require sign-in before granting internet access.

Common causes

• A captive portal is intercepting requests and requiring login.
• Network access requires authentication that has not been completed.

How to fix it

• Open a browser and complete the network sign-in process.
• Accept the terms of service for the network if required.