3CDaemon runs on Windows 11 in 32-bit compatibility mode. Users have reported success on both Windows 11 Home and Pro (21H2 through 23H2). However, you must manually configure firewall rules and adjust security settings to prevent Windows 11 from silently blocking the service.
Windows 11 may block inbound UDP 514 by default in Public networks. Fix: Change network profile to Private (Settings → Network & Internet → Ethernet/Wi-Fi → Private). Also, run 3CDaemon.exe as admin. 3cdaemon windows 11