Traffic was blocked by a Firewall rule within Cloudflare.
Resolution
If you are not the website owner
Provide the website owner with a screenshot of the 1020 error message you received.
If you are the website owner
- Retrieve a screenshot of the 1020 error from your customer
- Search the Firewall Events Log within the Overview tab of your Cloudflare Firewall app for the RayID or client IP Address from the visitor’s 1020 error message.
- Convert the UTC timestamp of the 1020 error to your local timezone when searching in the Firewall Events Log.
- Assess the cause of the block and either update the Firewall Rule or whitelist the visitor’s IP address in IP Access Rules.