407 Proxy Authentication Required

What it means

HTTP 407 Proxy Authentication Required is like 401, but the authentication is demanded by a proxy sitting between the client and the server rather than by the server itself. The response includes a Proxy-Authenticate header describing how to authenticate, and the client must supply credentials via Proxy-Authorization to continue.

When it happens

It happens on corporate or ISP networks where an authenticating proxy stands between users and the internet, or when an HTTP client is configured to use a proxy that requires a username and password.

How to fix it

• Provide valid proxy credentials in the Proxy-Authorization header or your client's proxy settings.
• Confirm the proxy address, port, and authentication scheme are configured correctly.
• If no proxy should be involved, remove the proxy configuration from the client or network.

SEO impact

None for public sites. It concerns proxy access on a private network and does not apply to how search engines crawl a public URL.