Proxy Errors Explained: 403, 429 & How to Fix Them

Debugging a scraping pipeline is hard enough without cryptic HTTP status codes. If you're seeing errors instead of data, it's time to decode what the server is trying to tell you.

Here are the most common proxy errors and exactly how to resolve them.

1. HTTP 403 Forbidden

The server understands your request but refuses to authorize it.

• The Cause: Your IP has a bad reputation, your headers look like a bot, or you're trying to access a restricted region.
• The Fix: Switch to Aethyn's Elite Residential Pool. If you're using Datacenter IPs, 403 is a sign they've been blacklisted.

2. HTTP 429 Too Many Requests

You've hit a rate limit.

• The Cause: You're sending too many requests from the same IP in a short window.
• The Fix: Enable IP Rotation. With Aethyn, you can rotate your IP on every request, making it virtually impossible to hit a 429 limit.

3. HTTP 407 Proxy Authentication Required

Your script isn't sending the correct credentials.

• The Cause: Wrong username/password or your server's IP isn't whitelisted.
• The Fix: Double-check your credentials in the Aethyn dashboard. Ensure you are using the correct format: user:pass@proxy.aethyn.io:8080.

4. HTTP 502 / 504 Gateway Error

The proxy server is having trouble connecting to the target website.

• The Cause: The target site is down, or the residential peer has disconnected.
• The Fix: Implement a "Retry" logic in your code. Since residential IPs can be unstable, a simple retry will usually fetch a new, working IP and solve the issue.

Troubleshooting Flowchart

1. Is it 407? Check credentials.
2. Is it 429? Slow down or increase rotation.
3. Is it 403? Use higher-quality residential IPs.
4. Is it 5xx? Retry the request.

Stop Guessing, Start Scraping

Aethyn's dashboard provides detailed error analytics so you can spot and fix issues before they impact your data delivery.

Fix Your Proxy Issues with Aethyn