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C
cf-1020
Easy Fix
Cloudflare · Edge Network
Cloudflare error 1020: Request blocked by Cloudflare firewall rule.
Quick Answer
Error code CF-1020 on your Cloudflare Edge Network means: Cloudflare error 1020: Request blocked by Cloudflare firewall rule.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
CF-BUSINESSCF-DNS-PROXYCF-ENTERPRISECF-FREECF-PAGESCF-PROCF-TUNNELCF-WORKERSCF-ZT
Likely Causes
  1. Cloudflare 1020 is a policy/configuration response where WAF/firewall rule blocked request by configured conditions.
  2. Zone-level DNS, WAF, access, or rate-limit settings conflict with legitimate request behavior.
  3. Hostname onboarding, tunnel routing, or security scope configuration is incomplete or too strict.
How to Fix It
1
Review Cloudflare dashboard controls relevant to 1020 (DNS, WAF, Access, Rate Limiting, Tunnel).
2
Simulate the blocked request with rule tracing to identify the exact policy match.
3
Adjust allow/deny scope for legitimate traffic while preserving security intent.
4
Confirm hostname/tunnel onboarding and routing targets are complete and healthy.
5
Validate expected traffic now passes without Cloudflare 1020.
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Related Error Codes
CF-1000CF-1001CF-1002CF-1003CF-1004
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