When signing into CloudFlare, a popular content delivery network and distributed domain name server system, the following error message is shown and the login is not successful with user unable to access the account and dashboard:

Sorry, this form has expired. Please try logging in again. Please ensure you have cookies enabled in your browser as this site requires them.

The error happens despite the cookies support is enabled in the web browser, no ads blocker used or with exception for CloudFlare added, and the login credentials used to login is correct.

To resolve the issue, try one of the following:

  1. Delete the cookies – you can just remove only individual cookies that contains cloudflare keyword.
  2. Try to use another web browser.