ROCK (1.8 build 764) on a celeron Nuck, but all the other clients (Android, iOS, Mac) are working OK.
Uninstalled Roon Client and removed all firewall rules, then reinstalled and gave TCP and UDP allows for both raatserver and roon exe. Also tried with disabled firewall. Still stuck at Roon Core Initializing.
Try temporarily turning off all Firewalls and Anti-virus on the Win 10 client and see if that helps. If so, then add Roon, RoonServer, Raatserver processes to the firewall approved list.
If you are running ROCK on that NUC, then you are using it in an untested and unsupported environment. ROCK is made specifically for the hardware listed on the supported hardware list. See here.
Now, that doesn’t mean it won’t work, just that you are doing so at your own responsibility, as that is considered Tinkering.
I had Roon Remote problems on 2 Windows 10 Pro 64 Bit PCs this week - both of which are entirely different in spec & set-up.
The only thing that worked - for both PCs - was a complete de-installation of Roon, including all directories, then re-installing the latest version from the website.