By default the WAN port is closed for everything and it has been like this since the earliest Dev and Beta versions went out.
So if you could access the WebUI then you must have enabled this by misstake.
However unless you have another firewall and the Almond+ is not directly exposed to Internet, then I would recommend you turn that off as soon as possible, you should never have anything open unless you really have a need for it, and can monitor for intrusions. I would not even want to have such a service running on a standard port such as port 80.