ZyXEL Communications VPN Series Handbook page 787

What Could Go Wrong?
1. If DNS Filter is not working, there are two possible reasons:
You have not subscribed for the DNS Filter service.
You have subscribed for the DNS Filter service but the license (Gold Security
Pack Standard) is expired.
2. You can click the link from the CONFIGURATION > Licensing > Registration screen
of your ZyXEL device's Web Configurator or click the myZyXEL.com from the
portal page (https://portal.myzyxel.com/) to register or extend your Gold
Security Pack Standard license.
www.zyxel.com
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