As a security measure, Cloudflare uses tokens to authenticate a session when a user is logged in to their Cloudflare account. The error message can occur if your ISP changed the IP address you're on, which invalidates the token, so logging out and logging back in will generally correct the issue. Alternatively, you can also clear your browser cache and cookies.
Modified on: Wed, 15 May, 2019 at 11:01 AM
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