Fix a proxy error
Proxy error pages each take one message, explain what it means, list the usual causes and walk through the fix in Windows, Chrome, antidetect browsers, phones and code. Every output shown was reproduced with real test proxies.
Fixing a 407 from your proxy: a credentials checklist
407 Proxy Authentication Required means the proxy is reachable but refused your login. Read the curl trace, find the credential mistake and fix it per app.
Read more →Chrome says ERR_PROXY_CONNECTION_FAILED: clear it in five steps
ERR_PROXY_CONNECTION_FAILED means Chrome cannot reach the proxy it is set to use. Find the leftover setting, wrong port or extension and fix it on any device.
Read more →Behind ERR_TUNNEL_CONNECTION_FAILED: reading the proxy's CONNECT reply
ERR_TUNNEL_CONNECTION_FAILED hides the proxy's real reply to CONNECT. Uncover the 407 or 502 behind it and fix Chrome, Puppeteer, Playwright or Android setups.
Read more →Firefox: "The proxy server is refusing connections" explained
Firefox says the proxy server is refusing connections when nothing accepts connections on the proxy port. Confirm it with curl, then fix Firefox settings.
Read more →What to do when Chrome suggests checking the proxy and the firewall
Chrome says try checking the proxy and the firewall? Go through the Windows proxy, WinHTTP, firewall, antivirus and VPN in order, then confirm with a retest.
Read more →When a proxy goes silent: diagnosing timeouts step by step
A proxy timeout means no reply came back before the limit. Read curl (28) and ERR_TIMED_OUT, set sensible Python timeouts and locate where packets get dropped.
Read more →Who sent the 502? Diagnosing Bad Gateway behind a proxy
Seeing a 502 Bad Gateway through a proxy? Learn to tell a proxy-side 502 from a website-side one, read the curl and Chrome output, and fix it in each tool.
Read more →Your proxy is set but the IP stays the same: where traffic slips past
Proxy IP not changing and IP checkers still show your own address? Find where traffic skips the proxy, compare IPs with curl, and rule out WebRTC leaks.
Read more →Start with one IP and see how it behaves
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