Virtual Device Serial0 Will Start Disconnected – Secure

The “Virtual device serial0 will start disconnected” message is a common informational warning that appears in various VMware products. It is not an indication of VM corruption or permanent failure, but rather a notification that the VM’s virtual COM port was unable to establish a connection during startup.

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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. This link or copies made by others cannot be deleted

To fix a disconnected state while keeping the port active, ensure the start-connected variable is set correctly alongside a valid file backing: Try again later

The virtual machine was created on an older server or a different computer that possessed physical serial hardware and was subsequently moved to a host that lacks it. How to Fix the Error (Step-by-Step)

For advanced users needing the port to start connected (e.g., for debugging or specific hardware mapping), ensure these lines exist in your .vmx file: serial0.present = "TRUE" serial0.startConnected = "TRUE"

Which and version are you using (VMware Workstation, ESXi, Fusion)?