ERR_TUNNEL_CONNECTION_FAILED Browser Origin: On your device Last updated 15 Oct 2026

Chrome: No internet — There is something wrong with the proxy server. ERR_TUNNEL_CONNECTION_FAILED

Chrome asked a proxy to open a tunnel (HTTPS CONNECT) to the website and the proxy refused or could not reach it.

Exact message you may see There is something wrong with the proxy serverUnable to connect to proxy
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Seen on: Chrome Edge Windows macOS

Meaning

This happens in corporate networks, on school/hotel Wi-Fi, and with misconfigured proxy or VPN software. The proxy may require authentication, may block the destination, or may be down. Check the system proxy settings first.

Common causes

  • Proxy server down, wrong address or port
  • Proxy requires credentials or blocks the site (filtering)
  • System proxy auto-configuration (PAC) script failing
  • VPN or security tool inserting a broken proxy
  • Corporate network allowing only some destinations

⚡ Quick fix

  1. Check the proxy settings and turn them off if you do not need a proxy
  2. Ask your network admin whether the site is allowed through the proxy
  3. Try another network or mobile hotspot

Detailed fix by platform

Windows

  1. Settings → Network & Internet → Proxy: turn off "Use a proxy server" and "Automatically detect settings" to test
  2. netsh winhttp show proxy and netsh winhttp reset proxy

macOS

  1. System Settings → Network → your connection → Details → Proxies: untick every protocol that is not required

Chrome

  1. Settings → System → Open your computer's proxy settings

How to diagnose

  1. Proxy — Is a proxy configured at all?
  2. Network — Does it work on a mobile hotspot?
  3. Policy — Is the site on a block list?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: On your device. Errors that are often confused with or caused by this one (click to open):

407 — HTTP 407 Proxy Authentication Required (HTTP)407417 — HTTP 417 Expectation Failed (HTTP)417511 — HTTP 511 Network Authentication Required (HTTP)511captive portal — Browser: This network requires you to sign in — captive portal (hotel, airport, café Wi-Fi) blocking HTTPS sites (Browser)captive portalDNS_PROBE_FINISHED_NO_INTERNET — Chrome: No internet — DNS_PROBE_FINISHED_NO_INTERNET (DNS probe finished, no internet) (Browser)DNS_PROBE_FINISHED_NO…DNS_PROBE_FINISHED_NXDOMAIN — Chrome: This site can’t be reached — server IP address could not be found. DNS_PROBE_FINISHED_NXDOMAIN (Browser)DNS_PROBE_FINISHED_NX…ERR_CONNECTION_RESET — ERR_CONNECTION_RESET: This site can’t be reached — The connection was reset (Browser)ERR_CONNECTION_RESETERR_PROXY_CONNECTION_FAILED — Chrome: Unable to connect to the proxy server. ERR_PROXY_CONNECTION_FAILED (Browser)ERR_PROXY_CONNECTION_…ERR_TUNNE…

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