After you define a Connection Limiting policy at the admin domain, you can assign it to an interface or subinterface.
Steps:
Click the Policy tab.
Select the domain from the Domain drop-down list.
Select Intrusion Prevention → Policy Manager.
Double-click on the interface to which you want to assign a connection limiting policy.
The <Device Name/Interface> panel opens on the right side.
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Under the Connection Limiting section, select the policy from the Policy drop down list.
Click Save.
Deploy the configuration changes to the Sensor.