Priority #3 - Disable Universal Plug and Play (UPnP)
The idea behind UPnP is great. All networked devices within the safe confines of the home network can see one another and play-friendly. No configuration menus to deal with in order to get devices to talk to one another. Nice and convenient. The problem with UPnP is that flaws in the design mean that it is possible for devices outside the home network (i.e. anywhere on the internet) to access devices inside the home network. This is really not good. Our next job is to disable UPnP.
The trick here is finding the option. It’s usually in the ADVANCED section, but it could be anywhere. A quick search for the router make and model plus ‘upnp’ will hopefully reveal how to find this important configuration option.
UPnP may be switched on by default. When you find it, switch it off.
Next up - Priority #4 - Disable Remote Management