Have you checked that Arc Control is granted proper internet access via your Wifi/LAN thru Windows Firewall (or third-party firewall if you use one)?
To check, enter "Windows Security" in the Windows system settings, click "Firewall and Network Protection" and then "allow access by an app through Windows Firewall". The actual items might be named a bit differently as Im using a German version of Win 11 and am translating what my UI shows.
There you should get a list of apps with checkboxes indicating whether they can access the internet through your private network and public networks. Make sure that for Intel Arc Control at least private is checked. You may also want to check public, as network configuration in Windows is sometimes not coherent. Before you change those settings you will need to click the "change settings" button on the top right to grant yourself admin access.
If Arc Control doesnt show up, you can try to add it manually (button on the right below the list). Select the ArcControl.exe file which should be located in C:\Program Files\Intel\Intel Arc Control\ (unless you changed the default installation path).
