511 Network Authentication Required

HTTP Status Code 511

The status code 511 stands for "Network Authentication Required". It means your device, the client, needs to go through some kind of verification process to connect to the network. This typically happens with proxy servers that control access to a network, like those you might find on a public wifi network at a coffee shop or airport.

Here's a breakdown of the code:

5xx: This category indicates server-side errors. In other words, the problem lies with the network you're trying to connect to, not your device.
511: This specific code within the 5xx category narrows it down to an authentication issue.

There are a couple reasons you might see this code:

Public Wifi: Many public wifi networks require users to sign in with a username and password or agree to terms of service before they can access the internet.
Corporate Network: Some companies restrict access to their internal network and require employees to log in with their work credentials before they can connect.

If you encounter a 511 error, look for a way to log in or accept any terms that might be presented. This could involve opening a web page, or entering a code that's displayed on the network.

HTTP Status Code 511

Other 5xx Status Codes