You can confirm the settings of registered key pairs and server certificates. You can also delete an unnecessary key pair and certificate, and check how a key pair is currently being used.
Press [Key and Certificate List] → [Key and Certificate List for This Device] → perform the following operation.
If user signature is disabled, it is not necessary to press [Key and Certificate List for This Device]. If you press [Key and Certificate List], the screen changes to the Key and Certificate List screen.
Key pairs for which 'Used' is displayed in <Status> cannot be deleted because they are being used with the IEEE802.1X authentication/IPSec or because TLS is set to 'On'. Press [Display Use Location] to check the type of security the key pair is being used for. To delete a key pair which is only being used with TLS, set the following settings to 'Off'. A key pair being used for IEEE802.1X authentication/IPSec cannot be deleted.
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