Most of the time, you will never know whether or not a website you are visiting is integrated with Cloudflare tools or resources. But if you encounter an Error 1020 from a Cloudflare site, you will immediately find out.
You are most likely to encounter an “Error 1020: Access Denied” message if you somehow violated the site’s firewall rules. Cloudflare will also block individual users in circumstances like these:
- Their IP address is associated with malicious activity
- They are using a VPN or proxy that’s on a blocklist
- They have triggered security rules due to unusual browsing patterns
- They are currently in a country or region that the website owner has chosen to block