You need to run "windows firewall with advanced security" (i.e. just the config tool in Windows) and add port 41952 as allowed. That is the only problem I had getting it working.
Oh disable firewall doesn`t actually help! that is what I also tried first
N.B.. also I need to specifically set the IP address in the TVersity settings for my host address. I didn`t mention that before as that has always happened in all previous OS and TV version.... guess it is a network adaptor order type thing and is nothing (specifically) Win10 related.