Go to System Configuration > SSL Settings > Under CA certificate .
Click Edit .
The Device Certificate page is displayed. You can view the enrolled device certificate details using filters.
Select the required device certificate and you can do the following:
Click Revoke.
Or
Click Delete.
When you revoke or delete the device certificate, the device VPN session is disconnected and the client is re-enrolled or re-connects device VPN for the next successful User VPN authentication.