ZyXEL Communications VPN Series Handbook page 564

What Could Go Wrong?
If you are not be able to configure any Application Patrol policies or it's not
working, there are two possible reasons:
You have not subscribed for the Application Patrol service.
You have subscribed for the Application Patrol service but the license is
expired.
You can click the link from the CONFIGURATION > Licensing > Registration screen
of your ZyXEL device's Web Configurator or click the myZyXEL.com 2.0 icon from
the portal page (https://portal.myzyxel.com/) to register or extend your
Application Patrol license.
www.zyxel.com
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