"virtual device serial0 will start disconnected" is when you've enabled a serial port but not defined a live connection. It does not indicate a problem with your virtual machine or device.
Method 2: Manually Editing the .vmx File (Recommended for Fusion)
You have a Serial Port added to your VM settings, but your actual laptop or desktop doesn't have a physical COM port. Conflict with Host Drivers:
If you are currently setting up a specialized environment, let me know: virtual device serial0 will start disconnected
Serial0 unassigned YES unset administratively down down
config t interface serial0 no shutdown
While this error rarely prevents the guest operating system from booting, it introduces annoying startup delays and indicates a misconfiguration in your virtual hardware settings. "virtual device serial0 will start disconnected" is when
The serial port is configured to use a physical host port that does not exist or is in use.
is set to "thinprint" incorrectly. You can often resolve this by following the VMware Knowledge Base Article 95329 or manually editing the file to ensure serial0.present = "FALSE" if you don't need the port [ For VMware ESXi/vSphere Users: Check Licensing:
For many users, this line appears as a yellow warning or an informational message. While it rarely prevents a VM from booting, it can cause confusion, especially for beginners or those troubleshooting serial port communication. Conflict with Host Drivers: If you are currently
A (COM port) is a legacy communication interface. While rarely used today for modern peripherals, they are essential for: Debugging operating systems (serial consoles). Communicating with networking hardware (switches/routers). Legacy application support.
If you configure the serial port to connect to a named pipe (used for debugging kernel-mode code or connecting two VMs) but the pipe name is wrong or the target application isn't listening, VMware will disconnect it at startup.