Virtual Device Serial0 Will Start Disconnected Jun 2026

: The VM is set to connect to a physical COM port on your host machine that does not exist or is currently being used by another application.

Completely the virtual machine (do not just suspend it).

In the tab, look through the device list and select Serial Port (or Serial Port 1 ). Click the Remove button at the bottom of the window. Click OK to save your changes and exit. Power on the VM. The warning will be gone. Method 2: Disconnect the Port at Power On virtual device serial0 will start disconnected

Here is a deep dive into why this happens and how you can fix it. Why Does This Message Appear?

In simple terms, the message indicates that the virtual machine has a configured (serial0), but for some reason, that port will not be connected to a host resource when the VM powers on. : The VM is set to connect to

If you are using ESXi, you must reload the VM configuration via the command line so the hypervisor recognizes the manual change:

Since the most common cause is the deprecated ThinPrint service, removing the virtual printer often stops the message. the virtual machine. Go to Virtual Machine Settings . Look for Virtual Printer in the device list. Select it and click Remove . Restart the VM to see if the message persists. Method 2: Manually Edit the .vmx File Click the Remove button at the bottom of the window

This is the leading cause in VMware Workstation and Fusion, especially after product upgrades. The message often appears together with "The virtual printing feature is globally disabled on this system". VMware once included a feature called ThinPrint for virtual printing, which was implemented through a virtual serial port. When VMware discontinued or disabled ThinPrint in newer releases (Fusion 13.5 removed the feature entirely), the VM tried to start the virtual serial port, found the configuration invalid, and generated the warning.