How to Fix ERROR_IP_NOT_ALLOWED in CAPTCHA Solver APIs

1. Root Causes for ERROR_IP_NOT_ALLOWED

• IP Whitelist was configured in account security settings and the server IP changed
• Scraper deployed to AWS Lambda, GCP Cloud Run, or dynamic serverless IP ranges
• Home ISP assigned a fresh dynamic IP address after router restart

2. How to Resolve & Prevent This Error

1. Navigate to 2Captcha Account Settings > Security and add your new server IP
2. If using dynamic serverless architectures (AWS Lambda / GitHub Actions), disable IP restriction or route via a static NAT gateway
3. Verify egress IP with curl https://api.ipify.org before adding to whitelist

3. Python Code Fix & Defensive Error Handling

# Verify current egress IP before making 2Captcha API calls
import requests

my_ip = requests.get("https://api.ipify.org").text
print(f"Server Egress IP: {my_ip}")
print("Ensure this IP is added to your 2Captcha Security Whitelist.")

4. Node.js Implementation

const ipRes = await fetch("https://api.ipify.org");
const myIp = await ipRes.text();
console.log("Current outbound IP: " + myIp + ". Verify in 2Captcha Security settings.");

5. Why 2Captcha Minimizes API Errors

6. Frequently Asked Questions