Virtual Device Serial0 Will Start Disconnected Jun 2026
Right-click the virtual machine in your library and select .
This alert is triggered by specific hardware mismatches or underlying software configuration updates within the hypervisor infrastructure:
The message "Virtual device serial0 will start disconnected" is the emulator's honest way of telling you, "I have no information about what this port should connect to, so I am leaving it in a safe, disconnected state."
When the virtual machine is configured to use a physical serial port on the host (e.g., COM1, /dev/ttyS0), VMware must access that device. If the port does not exist, is already in use by another application, or is locked by the operating system, VMware cannot connect to it. The typical error in this case is "serial0: Unable to open the COM1 serial port: No such file or directory" or "Access is denied". In Windows hosts, VMware needs appropriate permissions, which may require running the application as an administrator or checking the port's availability. virtual device serial0 will start disconnected
Provide instructions on creating a named pipe for serial communication in Windows. Let me know which of these would be most helpful! Share public link
If you don't need to print from the VM, the Printer device.
In VMware Workstation (versions 17.5+) and VMware Fusion (versions 13.5+), native architecture support for the ThinPrint virtual printing feature was completely removed. Virtual machines created in older releases still retain these printer links, which are structurally mapped directly through serial0 . The hypervisor flags an invalid parameter because the backing module no longer exists. Right-click the virtual machine in your library and select
2025-11-10T14:23:18.456Z| vmx| I125: Serial0: file type is device 2025-11-10T14:23:18.456Z| vmx| W110: Virtual device serial0 will start disconnected. 2025-11-10T14:23:18.456Z| vmx| I125: Serial0: No physical serial port autodetected.
: GNS3 uses the Dynamips emulator to run Cisco IOS images. A common problem occurs when a serial interface is configured on a router, but the Dynamips hypervisor crashes or fails to bring up the link.
If you think you might need the port later but want to stop the error message now, you can tell VMware to ignore it during boot. Go to > Hardware . Select Serial Port . The typical error in this case is "serial0:
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
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.
