Use this procedure to enable DAPP.
From the navigation tree, double-click QoS.
From the QoS tree, double-click QoS Agent.
Select the Configuration tab.
Under the DoS Attack Prevention Package section, choose the DappEnable mode:
disable (Default) - Disables DAPP.
enableWithoutStatusTracking - Enables DAPP without enabling status tracking.
enableWithStatusTracking - Enables DAPP and enables status tracking.
Click Apply.