HTTP 407 Proxy Authentication Required — Proxy Login Needed

HTTP 407 Proxy Authentication Required means you must authenticate with a proxy server before the request can be forwarded to the destination. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Similar to 401 Unauthorized but for proxy servers, not origin servers. The response includes a Proxy-Authenticate header specifying the authentication scheme. Client must resend the request with a Proxy-Authorization header. Common in corporate environments with authenticated web proxies. Applications must handle this differently from 401 — use proxy credentials, not server credentials. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Corporate proxy requires username and password authentication. Proxy session expired and requires re-authentication. Application not configured with proxy credentials. Proxy auto-detect sending traffic through an authenticated proxy. VPN or security software adding a local authenticated proxy. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Enter proxy credentials when prompted by the browser. Configure proxy authentication in your application: set http_proxy=http://user:pass@proxy:port. In browsers, check proxy settings: Settings > System > Proxy. For CLI tools, set environment variables: export HTTP_PROXY=http://user:pass@proxy:8080. Contact your network administrator for proxy credentials if you do not have them. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our HTTP Status Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.