ZyXEL Communications VPN Series Handbook page 772

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Two Factor with Google Authenticator Flow
1. Enable Google Authentication on specific admin user
2. Set up Google Authenticator
3. Configure valid time and login service types.
Enable Google Authentication on specific admin user
Select a specific admin user and switch to Two-factor Authentication tab.
CONFIGURATION > Object > User/Group > admin user
Enable Two-Factor Authentication for Admin Access checkbox. In Two-factor Auth.
Method, select "Google Authenticator". Click "Set up Google Authenticator" to start
setting up Google Authenticator on your mobile phone and USG.
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