Unlike standard network interfaces which are often auto-discovered and managed by the OS for Ethernet or Wi-Fi, serial connections require precise configuration. If the FT232R driver is missing or incorrect, the connection will fail silently.
Last updated: March 2025. Always consult the official Fortinet Hardware Compatibility List for your specific firmware version. ft232r usb uart driver fortinet
If the cable is already plugged in and showing as an "Unknown Device" in Device Manager , right-click it, select Update Driver select Update Driver