Virtual Device Serial0 Will Start Disconnected [work] -

Look for lines like:

If you don't use serial ports, delete the device. If you might use them later, leave it disconnected – your VM will run perfectly either way. This article applies to VMware Workstation Pro/Player 15–17, VMware Fusion 11–13, and ESXi 6.5 through 8.0. For older versions, the behavior and fix remain fundamentally the same. virtual device serial0 will start disconnected

If you have ever powered on a virtual machine in VMware Workstation, VMware Player, or VMware ESXi and glanced at the log files or the console output, you may have encountered the following message: "Virtual device serial0 will start disconnected." 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. Look for lines like: If you don't use

A: VirtualBox calls it "Serial Port 1 – disconnected" and Hyper-V shows no explicit warning unless you open guest settings. The behavior is VMware-specific in phrasing but functionally similar. For older versions, the behavior and fix remain

A: In VMware Workstation, you cannot suppress warnings globally. The only way is to connect the port to a valid target (file or pipe) or remove it.

This comprehensive article explains exactly what this message means, why it appears, when it is a problem, and how to fix or suppress it. In simple terms, the message indicates that the virtual machine has a configured serial (COM) port (serial0), but for some reason, that port will not be connected to a host resource when the VM powers on.