Proxy error fixes
Each page explains one error message: what it means, the most likely causes, and how to fix it in Windows, Chrome, antidetect browsers, phones and code. The outputs shown were reproduced on real test proxies.
How to fix 407 Proxy Authentication Required
A 407 Proxy Authentication Required error means the proxy answered but rejected your login. See real curl output, the likely causes and fixes per app.
Read more →How to fix ERR_PROXY_CONNECTION_FAILED in Chrome
ERR_PROXY_CONNECTION_FAILED means Chrome could not open a connection to the proxy it was told to use. Causes, real output and fixes for Windows, Mac, Android.
Read more →Fixing ERR_TUNNEL_CONNECTION_FAILED with a proxy
ERR_TUNNEL_CONNECTION_FAILED means Chrome reached the proxy but no HTTPS tunnel opened. How to read the CONNECT code and fix it in Chrome, Puppeteer, Android.
Read more →The proxy server is refusing connections: what it means
Firefox says the proxy server is refusing connections when the proxy port accepts no connections. Find the cause with curl, test the port, fix Firefox.
Read more →Checking the proxy and the firewall: a practical checklist
Chrome suggests checking the proxy and the firewall when a page will not load. Work through the Windows proxy, WinHTTP, firewall and antivirus, then retest.
Read more →Proxy timeout errors: the connection hangs, then gives up
A proxy timeout means no answer arrived before the wait limit. Tell curl (28) and ERR_TIMED_OUT apart, tune Python timeouts and find where traffic is blocked.
Read more →502 Bad Gateway proxy errors: find out who sent it
A 502 Bad Gateway through a proxy means a middle server got no valid reply. How to tell whether the proxy or the website is at fault, with real curl output.
Read more →Proxy IP not changing: why checkers still show your real IP
Set up a proxy but checkers still show your real IP? Why the proxy is not applied, how to compare IPs with curl, test for WebRTC leaks and what static IPs mean.
Read more →Ready to run on clean IPs?
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