Topic guides
Cloudflare Error 522 Connection Timed Out Through a Proxy: What Actually Fixes It
A 522 is Cloudflare failing to reach the site's origin, so swapping proxies almost never fixes it. What causes it, why scrapers see it more, and what to do.
How to Scrape Flight Prices: The Complete 2026 Guide
How to scrape flight prices: why airline and OTA sites are hard, why point-of-sale pricing forces an in-market exit, how to handle Akamai and JavaScript, and the residential proxy setup that holds.
How to Scrape Hotel Prices: The Complete 2026 Guide
How to scrape hotel prices: why the rate depends on the guest's country, login and device, how to read Country Rates and member rates, and the residential proxy setup that reads each market's price.
How to Turn Off a Proxy on Windows 11, Mac, Chrome, and Your Phone
Where the proxy switch lives on Windows, macOS, Chrome, Edge, Firefox, Android, and iPhone, how to prove it is off, and what it means when it returns.
net::ERR_PROXY_CONNECTION_FAILED in Puppeteer, Playwright, and Selenium: Causes and Fixes
Headless Chromium reports proxy failures as net:: errors on page.goto. What each means, why 127.0.0.1 fails inside Docker, and how each framework passes credentials.
npm Proxy Settings: Fix ECONNRESET, ETIMEDOUT, 407, and "You Are Behind a Proxy" Errors
npm's network errors all end with the same proxy hint. How npm finds its proxy, the .npmrc keys, the certificate fix for corporate proxies, and what each error means.
pip Behind a Proxy: Fix "Cannot Connect to Proxy", 407, and Certificate Errors
How pip finds its proxy, the --proxy flag and pip.conf keys, and the fix for each error: cannot connect to proxy, 407 in the tunnel, and certificate verify failed.
Proxies for MCP Servers: The Fetch-Heavy Ones Need Residential IPs, and Where the Proxy Goes
An MCP server that fetches the web, a scraper, a search tool, a price checker, hits the same bot walls and per-IP limits as any client, so it needs residential proxies. One that talks only to a private API does not. This covers which MCP servers need a proxy, where it goes in the server, and how to wire it in the common runtimes.
Proxies With the Claude Agent SDK: Proxying the Agents You Build, Not the Model
The Claude Agent SDK is Claude Code as a library, so the agents you build with it browse the web through built-in and custom tools. This guide shows where a proxy goes: in the custom tools and subprocess code that fetch sites, and the process-level HTTP(S)_PROXY for reachability, with the honest note that the SDK's own model calls do not want one.
A "Proxy Authentication Required" Popup Keeps Appearing: Where It Comes From and How to Stop It
Windows, Chrome, Firefox, and Outlook show a proxy sign-in box when a proxy answers 407. Which setting is asking, what to enter, and how to remove a proxy you never set.
"Proxy Error: The Proxy Server Received an Invalid Response From an Upstream Server" (Apache 502)
Apache's mod_proxy reporting that the server behind it did not answer properly. What each Reason line means, why your own proxy settings are irrelevant, and the admin fixes.
The Proxy Server Isn't Responding: 5 Fixes for Windows and Edge
This message comes from Windows itself, not a website. Where the proxy setting behind it lives, how to clear it in every place Windows keeps it, and what to do next.
Proxy Server on PS5, PS4, and Switch: Use or Do Not Use, and What It Cannot Fix
Consoles ask about a proxy server during manual setup. For almost everyone the answer is Do Not Use. When one helps, what it cannot fix (NAT type, lag), and how to set it.
Proxy Settings Keep Turning Back On? Find What Is Writing Them
Something keeps rewriting your proxy setting: a leftover VPN, a policy or profile, or malware. How to identify the writer on Windows and Mac and remove it for good.
Proxys für Web Scraping: der praktische Leitfaden
Proxys für Web Scraping: warum du sie brauchst, welcher Typ zu welchem Ziel passt, wie viele IPs, rotierend oder statisch, und wie du Sperren vermeidest statt sie mit CAPTCHA-Lösern zu überkleben.
Reddit "You've Been Blocked by Network Security": Why It Happens and How to Fix It
Reddit shows this page when your address looks like a VPN, proxy, or datacenter range. What triggers it, the fixes that work, and why logging in is the route Reddit offers.
Scrapy TunnelError: "Could Not Open CONNECT Tunnel With Proxy" (407, 403, 502) Explained
Scrapy's TunnelError means the proxy answered the CONNECT request with a status other than 200. What each status means, the Proxy-Authorization trap, and the fix.
YouTube "Sign in to Confirm You're Not a Bot": Fixes in the Browser and in yt-dlp
YouTube shows this when the address or session looks automated. What it means in a browser and in yt-dlp, the wiki's cookie advice, and where a proxy helps.
SOCKS5 Proxy Errors Explained: General SOCKS Server Failure, Not Allowed by Ruleset, Host Unreachable
SOCKS5 replies are numbered by the protocol, so each error names its cause. What the reply codes and authentication failures mean, and the fix for each.
"Sorry, You Have Been Blocked" (Cloudflare): Why You See It and How to Get Through
Cloudflare's block page means a site's rule refused your request, usually because of the address you came from. What triggers it and what you can change.
Spotify Error Code 4 and "A Firewall May Be Blocking Spotify": The Proxy Settings Fix
Spotify shows error code 4 when the desktop app cannot reach its servers and blames the firewall or the proxy settings. Which proxy mode to pick, and what else breaks it.
There Is Something Wrong With the Proxy Server: How to Fix It
Chrome and Edge show this when Windows points at a proxy that does not answer, and most people never set one. How to find it, switch it off, and stop it returning.
Unable to Connect to the Proxy Server: Fixes for Every Device
Chrome's older wording for ERR_PROXY_CONNECTION_FAILED, still common on Android and Chromebooks. Where the proxy setting lives on each device and how to clear it.
Windows Could Not Automatically Detect This Network's Proxy Settings: How to Fix It
What the troubleshooter actually checked, why it blames the proxy, and the fixes in order: a leftover proxy setting, WinHTTP, the VPN, Winsock, and the driver.
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Proxies that don't die mid-job
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