Did you install the latest Intel LAN driver package or are you running with just what you got during the Windows 10 upgrade?
After a bit a scratching it turn out that it was my antivirus taking over my firewall settings!!
It's weird though it had different rules for the lan and the Wlan...
Working now. long live the NUC
I’m glad to hear that your Intel® NUC is now up and running.
Enjoy your Intel® NUC!