← All status codes4xx – Client Error

HTTP 495 – SSL Certificate Error

(NGINX) The client presented an invalid SSL certificate during mutual TLS authentication.

Common use case

Surfaces in mutual TLS (mTLS) setups, e.g. internal service-to-service APIs, when a client presents an expired, untrusted, or malformed certificate.

History

An NGINX-specific extension for reporting client-certificate failures in mTLS configurations.

Did you know?

It only ever appears on servers configured to require client certificates - a setup far more common for internal APIs than public-facing websites.

Other 4xx codes

400Bad Request401Unauthorized402Payment Required403Forbidden404Not Found405Method Not Allowed406Not Acceptable407Proxy Authentication Required408Request Timeout409Conflict410Gone411Length Required412Precondition Failed413Content Too Large414URI Too Long415Unsupported Media Type416Range Not Satisfiable417Expectation Failed418I'm a teapot422Unprocessable Content425Too Early426Upgrade Required428Precondition Required429Too Many Requests430Shopify Security Rejection431Request Header Fields Too Large444No Response451Unavailable For Legal Reasons460Client Closed Connection463Malformed X-Forwarded-For Header464Incompatible Protocol Versions494Request Header Too Large496SSL Certificate Required497HTTP Request Sent To HTTPS Port499Client Closed Request