Managing Static NAT
Once you have created a static NAT, managing it can be performed from the "IP Address" details view. You can disable the NAT by clicking on the "Disable Static NAT" button. You will be prompted for confirmation for this action.
OR from the "IP Addresses" view, you can disable a static NAT by clicking on the button.
Note: Disabling static NAT removes it from the portal completely. You will have to recreate it if you wish to use it in the future.
From the "IP Address" details view, you can also add firewall rules to your NAT to control how traffic is controlled from the public IP to the internal virtual machine address. For more information about creating firewall rules, go HERE