Fix Claude AI Error 1020 Access Denied (2025)

Updated: 11/29/2025

You open the Claude AI site to get work done, and instead of the chat interface you see a page with Access Denied, Error 1020. The text usually mentions that the site owner has set restrictions that prevent you from accessing the page, which feels vague and frustrating. In practice, Error 1020 means Claude AI security rules, often powered by Cloudflare, are blocking your device, IP address, or browser behavior because it looks risky or does not meet the access criteria [web:44][web:45][web:46][web:56].

Table of Contents

Method 1: Fix Browser Session And Security Settings

Temporarily turn off ad blockers, script blockers, or privacy extensions that modify headers and cookies, then reload Claude AI and attempt to log in again. These tools can accidentally remove or alter the values Claude uses to confirm that your traffic is legitimate, which leads to the Access Denied page [web:45][web:56].

Warning: Only disable extensions you recognize and trust, if you see an extension you do not remember installing, consider removing it entirely since some malware can also trigger security blocks.

Method 2: Adjust Network And IP Related Factors

If you are on an office or school network, share the exact Error 1020 message and time with your IT team so they can review firewall logs and filtering policies. Some corporate security tools rewrite traffic in ways that conflict with Cloudflare rules, and only an administrator can adjust those settings [web:56].

Method 3: Verify Account Status And Security

Take a screenshot of the Error 1020 page, including any request IDs or timestamps, and submit a ticket through Claude AI official support channels. Provide details such as your region, whether you use VPNs, and what troubleshooting steps you have already tried, so the team can review logs and adjust rules if appropriate [web:46][web:53][web:59].