Why Your Proxies Keep Getting Blocked (and How to Fix It)

Diagnosis 1: Datacenter IP Detection

If you're blocked immediately on the first request, the likely cause is datacenter IP detection. Websites maintain databases of IP ranges belonging to hosting providers.

Solution: Switch to ISP or residential proxies. Botosaur offers ISP proxies that bypass datacenter detection. See our guide to proxy types.

Diagnosis 2: Rate Limiting

If your proxy works initially but gets blocked after a burst of requests, you're hitting rate limits.

Solution: Implement delays (2-5 seconds minimum). Use a larger proxy pool and distribute requests.

Diagnosis 3: Browser Fingerprinting

If you're blocked even with residential proxies and slow request rates, fingerprint detection is likely.

Solution: Use an anti-detect browser. See our anti-detect browser setup guide.

Diagnosis 4: Poor IP Reputation

If some proxies work while others get blocked instantly, those IPs have been flagged from previous abuse.

Solution: Use a provider like Botosaur that actively monitors IP reputation.

Diagnosis 5: Header Leaks

If websites detect your proxy despite residential IPs, headers like X-Forwarded-For may be leaking.

Solution: Audit HTTP headers. Ensure Accept-Language and timezone match your proxy's location.

Our recommendation: Start by checking whether your IPs are datacenter or residential. This single factor accounts for over half of all proxy blocks. If you're still using free proxies, read why free proxies are dangerous.