Causes
A client or browser is blocked by a Cloudflare customer’s Firewall Rules.
Fixes
If You Are Not The Website Owner:
Step 1: Provide A Screenshot
provide the website owner with a screenshot of the 1020 error message you received.
If You Are The Website Owner:
Step 1: Retrieve A Screenshot
Retrieve a screenshot of the 1020 error from your customer
Step 2: Search The Firewall Events Logs
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.
Step 3: Update The Firewall Rule
Assess the cause of the block and either update the Firewall Rule or whitelist the visitor’s IP address in IP Access Rules.
Step 4: Convert UTC Timestamp
Convert the UTC timestamp of the 1020 error to your local timezone when searching in the Firewall Events Log.