How can dont show captive portal for for unknown users in policy with web filtering
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Also if you wish to not show captive portal to unauthenticated users then go to Authentication -> Services
At the very bottom of the page you will see a section labelled 'Actions for Unauthenticated Users (Captive Portal)'
Select NO for the option 'Prompt unauthenticated users to login'
and the XG will no longer show unauthenticated users the captive portal
With this option all unauthenticated users will not be shown a captive portal. You will have to make sure that your users authenticate using some other procedure (STAS, Radius, etc)
This and you also have to make sure you have selected 'Match known users' in the firewall rule as well