Under Add Service Rule, enter the necessary information such as Name, IP Protocol, Starting Port, and Ending Port.
When the new service has been created successfully, again, go back to the Configuration menu.
Choose Object and then the Service menu.
Now, click the Service Group tab, search for “Default_Allow_WAN_To_ZyWALL” and click it.
Select the Edit button and check the management port value. If the port value is the default value, choose the right service object you created from the list.
You can find the right direction arrow symbol. Click on it to add the members to the list.
After that, go to the Status overview and check the WAN IP address of the router.
You can access Zyxel router remotely by entering the WAN IP address.