Fix Claude Stuck on Checking Your Browser Verification Loop

When trying to access Claude.ai, you may occasionally get stuck in an infinite loop on the "Checking your browser before accessing Claude.ai" screen. This page is managed by Cloudflare, Anthropic's security partner, to protect the platform against Distributed Denial of Service (DDoS) attacks and malicious automated bots. If your browser fails to pass these verification challenges, you will be locked out of the interface entirely. Use this guide to resolve the loop and regain access.

Why Claude gets stuck on browser verification Cloudflare checks several signals to ensure you are a legitimate human user. The check can fail or loop infinitely due to: * Corrupted browser cookies or outdated local storage. * Privacy-focused extensions or ad blockers interfering with Cloudflare's JavaScript challenge. * Out-of-sync system time settings. * Blocked or blacklisted IP addresses from virtual private networks (VPNs) or proxy servers.

How to bypass the browser check loop

Follow these sequential steps to resolve the verification block on Claude.ai:

1. Clear Claude.ai site cookies and storage cache Corrupted security tokens from previous sessions can cause the verification challenge to fail repeatedly. * In Google Chrome or Brave, click the padlock/tune icon next to the URL in the address bar. * Select "Site settings" or "Cookies and site data", then choose "Manage cookies and site data." * Click the trash icon next to claude.ai to remove all local data, then refresh the page. * In Firefox, click the padlock icon, select "Clear cookies and site data...", and click "Remove".

2. Disable privacy extensions and aggressive ad blockers Extensions that block canvas fingerprinting, WebGL, or strict tracking scripts can prevent Cloudflare's security challenge from executing successfully. * Temporarily disable privacy-focused browser extensions like uBlock Origin, Privacy Badger, NoScript, or Ghostery. * If you are using the Brave browser, click the Brave Shield icon in the URL bar and toggle it off for Claude.ai. * Reload the page to see if the verification completes. If it does, whitelist Claude.ai in your security extensions.

3. Synchronize your system's clock Cloudflare's security handshakes rely on highly accurate timestamps. If your computer's clock is off by even a minute, the cryptographic verification checks will fail. * On Windows: Open Settings > Time & Language > Date & Time. Click "Sync now" under the "Synchronize your clock" section. * On macOS: Open System Settings > General > Date & Time. Ensure "Set time and date automatically" is toggled on, and select a reliable network time server.

4. Deactivate or relocate your VPN or Proxy Cloudflare regularly blocks or flags IP addresses associated with public VPN nodes or commercial proxies because of high volumes of bot traffic. * Disconnect your VPN or proxy client entirely and reload Claude.ai using your standard ISP connection. * If you must use a VPN, try switching to a different server location or a dedicated IP address that has not been flagged by Cloudflare.

5. Test in a clean browser profile or incognito window To isolate whether the problem is browser-specific, test the connection using a clean slate. * Open an Incognito or Private Browsing window and try navigating to Claude.ai. * Alternatively, try logging in using a different web browser (e.g., switching from Chrome to Edge or Safari). If this works, the issue is isolated to your primary browser's profile settings.

When to escalate If you have tried all the steps above and are still stuck on the "Checking your browser" loop for more than an hour, the issue may be a false-positive block on your IP address range or a wider regional Cloudflare routing failure. Check third-party status tools to see if Cloudflare or Anthropic is experiencing a global outage. If you are an enterprise customer or have a paid subscription, try connecting via your mobile device's cellular data connection. If the cellular connection works, your home or office IP address is temporarily blacklisted; you will need to contact your network administrator or wait for the IP's reputation to clear.