I disabled the firewall and enabled it again and it is again working. Confused!!!!
I have been reading on Google that if I add an item that is connected to the router to the DMZ, it should respond to the pings. At the moment, I have put all the items on my network into the DMZ one by one, but can't find one that will respond.
I realise the home hub isn't supported, but there must be a work around somewhere?