{"slug":"http-407-proxy-authentication","name":"HTTP 407: proxy authentication","category":"diagnostic","provider_slug":null,"publisher":"IETF","publisher_type":"official","website":"https://www.rfc-editor.org/rfc/rfc9110.html#name-407-proxy-authentication-req","summary":"Identify a proxy authentication challenge and check the credentials sent to the proxy.","tools":[],"capabilities":["error-handling"],"outputs":["Diagnostic guidance"],"connection":"proxy","billing_basis":"Protocol reference; request charges depend on your provider.","facts":[{"label":"Meaning","value":"The proxy needs valid authentication credentials.","source_ids":["docs"]},{"label":"Challenge","value":"The response supplies a Proxy-Authenticate challenge.","source_ids":["docs"]},{"label":"Client response","value":"The client can retry with an appropriate Proxy-Authorization header.","source_ids":["docs"]}],"setup":["Inspect the proxy's authentication challenge.","Configure the proxy credentials in your client's proxy settings, then retry."],"limitations":["A 407 identifies an authentication problem, not its account-specific cause."],"sources":[{"id":"docs","label":"HTTP Semantics: 407 Proxy Authentication Required","url":"https://www.rfc-editor.org/rfc/rfc9110.html#name-407-proxy-authentication-req","checked_at":"2026-09-27"}],"checked_at":"2026-09-27","review_due":"2026-10-27","evidence":"documented","url":"https://workingproxysites.info/tools/http-407-proxy-authentication","provider_url":null,"review_overdue":false}