FortiGate – Delete a VLAN Interface Greyed Out

Problem

I want to delete an VLAN interface I just created on a Fortinet FortiGate firewall, but the delete button is greyed out 😠

Solution

I personally think this is one thing especially if you are new to FortiGate firewalls that is not as good as it could be in the GUI. It would be better if the button was active and just gave you a pointer why you can’t delete just yet.

The reason the delete option is nit available is because there is other configuration referencing it.  You need to remove this other configuration before you can delete the interface. This is confusion if you create an interface by mistake and want to delete it as the FortiGate has automatically created some addition configuration using your new interface, blocking deletion.

The easiest way to find configuration referencing you interface is to click on the number in the “Ref” Column

In the popup that appears you will need to check and delete the referencing configuration.

After removing all of the referencing configuration the Delete button will be available.

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