Port blocking policies allow you to selectively block ports from sending or receiving data.
Port Blocking Policy for a Distributed Port Group
The Miscellaneous policies dialog allows you to configure various distributed port group policies.
1 Log in to the vSphere Client and select the Networking inventory view.
2 Right-click the distributed port group in the inventory pane, and select Edit Settings.
3 Select Policies.
4 In the Miscellaneous group, choose whether to Block all ports in this distributed port group.
5 Click OK.