Err_proxy_certificate_invalid Jun 2026

The error is a specific security warning in Chromium-based browsers (like Google Chrome, Microsoft Edge, and Brave) indicating that the SSL/TLS certificate used by your proxy server cannot be verified. Unlike standard SSL errors that affect a single website, this error typically blocks all outgoing traffic because the "middleman" (your proxy) is deemed untrusted. Core Causes of ERR_PROXY_CERTIFICATE_INVALID