A: Upgrades often deprecate or remove features. Fusion 13.5 removed ThinPrint entirely, causing the virtual printer serial port to be invalid. Similarly, upgrading Workstation may carry over outdated .vmx settings that trigger the warning.
Troubleshooting VMware: "Virtual device serial0 will start disconnected"
If you do not use serial communication for your VM, the best approach is to remove the port. the virtual machine. Open Virtual Machine Settings . Select Serial Port 1 (or Serial0). Uncheck Connect at power on or click Remove . Save settings and restart the VM. Method B: Configuring the Serial Port Correctly
EVE-NG handles this more elegantly, but the principle is the same. virtual device serial0 will start disconnected
It typically appears as a pop-up window immediately after you power on a virtual machine (VM). While it often looks like a critical error, it is usually just a configuration notification.
The method for resolving the warning depends on whether your VM is running on a Windows/Linux host or a macOS environment.
The syntax used to identify serial ports differs between operating systems: Windows hosts expect COMx notation, while Linux and macOS use device node paths like /dev/ttyS0 . Using an incorrect naming convention in the .vmx file will cause VMware to fail when trying to open the device. A: Upgrades often deprecate or remove features
Emulating unplugged hardware:
If you prefer to keep virtual printing enabled (and your VMware version supports it), you can enable it globally:
The serial port is configured to use a physical host port that does not exist or is in use. Select Serial Port 1 (or Serial0)
This tells Dynamips to create a direct serial cable between the two virtual devices on boot.
: The VM configuration might be set to map serial0 to a physical COM port on the host machine that is currently in use by another application or simply does not exist.