@Age_Holder, welcome to the Community. Is your Roon Server (the updated name for the Core) running Windows? If so, you may need to create a new Windows firewall exception rule for roonapplicance.exe. Is your screenshot from your Roon Server computer or from a Roon Remote?
The screenshot is from my computer, I have also included a screenshot of the firewall and by the looks of it, everything looks fine.
As for the name, I have never changed it, unless I gave it a name whilst installing it. If that’s the case I have no idea what the name is