Issue symptoms

When one of your customers or agents attempts to sign into the Zendesk customer portal, they receive the following error message: Forbidden Invalid authenticity token.

forbidden_invalid_authenticity_token.png

Resolution steps

This error is likely caused by a corrupted cookie in your browser. Complete the following troubleshooting steps:

  1. Disable any anti-tracking or security software.
  2. Clear your cache and cookies and attempt to sign in again.
  3. If that does not resolve the issue, ensure third-party cookies are enabled in the browser.
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