FreeNAS

In the old GUI, you could clear out the IP address field on an interface and select the "------------" placeholder option from the network mask drop down in order to remove an IP address from an interface. However, after you clear out the IP address field in the new GUI, there is no placeholder option in the network mask drop down to select to remove the address. Due to the validation logic in the new GUI, you can't save the empty field for IP address because something (other than the missing placeholder) is selected in the network mask drop down.