Proxy errors and how to fix them

ERR_PROXY_CONNECTION_FAILED and ERR_TUNNEL_CONNECTION_FAILED: What Each Means and How to Fix It

One error means the proxy never answered; the other means it answered and said no. Checking the host and port again only fixes the first one.

Cloudflare Error 1015 “You Are Being Rate Limited”: Causes and Fixes

Unlike 1020, a 1015 clears on its own. The question is how long it lasts, what the counter is actually counting, and why a fresh IP sometimes changes nothing.

cURL Proxy Errors Explained: Exit Codes 5, 7, 28, 35, 56 and 97

cURL is the fastest way to prove whether a proxy works — once you can read what it is telling you. Every exit code maps to one leg of the connection.

“Our Systems Have Detected Unusual Traffic”: Why Google Shows It and How to Stop It

Google is not accusing you personally. It is saying the IP address you share has sent more automated-looking searches than it tolerates — and that changes what the fix is.

Stuck on Cloudflare “Verify You Are Human”? Why the Loop Happens and How to Break It

Passing the check is not the problem — keeping the proof is. Almost every loop is the browser losing, rejecting or invalidating the clearance cookie it was just given.

8 min

502 Bad Gateway and 504 Gateway Timeout Through a Proxy: Who Failed, and How to Tell

Two or three gateways can sit between you and the page, and any of them can send a 502. The fix depends entirely on which one did.

8 min

ERR_EMPTY_RESPONSE and ERR_CONNECTION_RESET: When the Connection Closes With Nothing

One error is silence, the other is a slammed door. Both happen after a connection was already open — which rules out half the usual suspects straight away.

11 min

HTTP 403 Forbidden: What Causes It and How to Fix It

403 means the request arrived, was understood and was refused. Which layer refused it decides the fix — and rotating IPs is the right answer far less often than people assume.

HTTP 429 Too Many Requests: How Rate Limits Work and How to Survive Them

429 is the one error that gets worse the harder you try. Read the headers, back off properly, and spread load across identities instead of hammering one.

407 Proxy Authentication Required: Every Cause and Its Fix

The one proxy error that is entirely on your side of the connection — and the handful of clients that cause it even when your credentials are perfect.

Cloudflare Error 1020 Access Denied: What Triggers It and How to Get Past It

1020 is not a rate limit and not a CAPTCHA — it is a rule someone wrote, matching something about your request. Finding out what it matched is the whole job.

Proxy Error Codes Explained: 407, 429, 502 and the Rest

Which errors come from the proxy and which from the target, why that distinction saves hours, and the specific fix for each code.