Create an authentication policy rule to protect chosen services or apps with the
authentication portal.
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In the Palo Alto NGFW admin portal, go to , and then click Add.
The
Authentication Policy Rule window is displayed.

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On the General tab, enter a name for the rule in the
Name field.
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On the Source tab, from the Source
Zone list, select an option.
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On the Destination tab, from the Destination
Zone list, select an option.
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On the Service tab, select the services or URL
categories to protect.
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On the Actions tab, from the Authentication
Enforcement list, select the authentication enforcement that you
created in the previous section. Click OK.
For further information, see Authentication Policies.