
Proxy Error Codes Explained: 403, 407, 429, 502 and More (2026)
A lookup table for proxy error codes 403, 407, 429, 502 and 504. See who returned each status, what it means, and the fix that actually works.
86 articles

A lookup table for proxy error codes 403, 407, 429, 502 and 504. See who returned each status, what it means, and the fix that actually works.

Pool size and price per GB don’t pick a good proxy provider. This checklist covers success rate, true cost per request, traffic expiry, trials, sourcing and support.

A transparent proxy passes your real IP to every site you visit. Learn what transparent, anonymous and elite proxies are, which headers give them away, and how to test yours.

Every residential proxy IP is someone’s home connection. Learn how proxy pools are built, what makes proxies ethically sourced, and six questions to ask a provider before you buy.

Proxy geo-targeting picks where your exit IP is located. Learn how country, city and ASN filters work, why narrow targeting shrinks the pool, and when precision is worth it.

Set up a proxy on iPhone and Android in a few taps: where the Wi-Fi proxy setting hides, manual vs PAC setup, proxy logins, which apps ignore it, and the limits nobody mentions.

Copy-paste cURL proxy commands for HTTP, HTTPS and SOCKS5, plus proxy authentication, environment variables, .curlrc and how to read a 407 in verbose output.

A backconnect proxy is one gateway that fronts a whole IP pool. Learn how it picks exit IPs, the four ways providers let you steer it, and how rotation and sticky sessions work.

Set up a proxy on Windows 11 the right way: manual, setup script or auto-detect, what to do about proxy logins, which apps ignore the setting, and how to prove your IP changed.

Work out how many GB of proxy bandwidth you need with one simple formula, real page-weight numbers, worked examples, ways to cut usage, and when per-IP plans beat per-GB.

A forward proxy works for the client and hides who’s asking. A reverse proxy works for the server and hides who’s answering. Here’s how each one handles traffic, where CDNs and load balancers fit, and which one you actually need.

Datacenter proxies are fast and cheap. Residential proxies cost more per GB but get past strict sites. Here’s how they differ on trust, speed and pricing, and how to pick the right one for each target.