HTTP 407 Proxy Authentication Required — Proxy Login Needed

Overview

HTTP 407 Proxy Authentication Required means you must authenticate with a proxy server before the request can be forwarded to the destination.

Key Details

• 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

Common Causes

• 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

Steps

1. 1Enter proxy credentials when prompted by the browser
2. 2Configure proxy authentication in your application: set http_proxy=http://user:pass@proxy:port
3. 3In browsers, check proxy settings: Settings > System > Proxy
4. 4For CLI tools, set environment variables: export HTTP_PROXY=http://user:pass@proxy:8080
5. 5Contact your network administrator for proxy credentials if you do not have them

Tags

More in 4xx Client Error

Frequently Asked Questions