← All Status Codes
407
Proxy Auth Required
⚠️ Client Error
Medium Risk
📖 What Is HTTP 407?
Authentication with the proxy server is required before the request can be forwarded. Similar to 401 but for proxy authentication.
🛡️ Security Implications
Proxy credentials may be transmitted in cleartext if not using HTTPS. Ensure proxy authentication occurs over encrypted connections.
🔍 Common Causes
Corporate proxy requires authentication. VPN or proxy misconfiguration. Missing proxy credentials in client configuration.
🔧 How to Fix
Configure proxy credentials in browser or system settings. Contact network administrator for proxy access.
🖥️ How to Check
curl -I -o /dev/null -w "%{http_code}" https://example.com