Deregistration from the GUI 7.2.1
An administrator can deregister a FortiGate, if the device has been registered for three or more years, using the GUI or CLI, without having to contact FortiCare administration. After the device is deregistered, all associated contracts are also deregistered, and all of the administrator's information is wiped.
To deregister the FortiGate in the GUI:
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Go to Dashboard > Status.
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In the License widget, click FortiGate Support and select Deregister FortiGate.
The FortiCare Deregistration pane opens.
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Enter your password then click Next.
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Confirm the FortiGate deregistration then click Submit.
If the FortiGate has been registered for less then three years, the deregistration will fail.
To deregister the FortiGate in the CLI:
# diagnose forticare direct-registration product-deregister <accountID> <password>
If the FortiGate has been registered for less then three years, the deregistration will fail:
forticare_product_deregister:1335: Failed to get response (rc = 0, http_code = 403) Unit deregistration unsuccessful.