If you need serial0 active at boot:
The error occurs because the virtual machine's configuration file ( .vmx ) instructs VMware to connect a virtual serial port (COM port) to a physical or logical resource that is missing, busy, or inaccessible on your host machine. The most common triggers include:
A: No. Real hardware will show "%LINK-3-UPDOWN: Interface Serial0/0, changed state to down" if no cable is plugged in, but it will never announce "virtual device."
. If the printer is not needed, you can remove the device entirely. Edit the .vmx File virtual device serial0 will start disconnected
Right-click the VM in your VMware library and select . Go to the Hardware tab.
: For users of VMware Fusion or advanced users, manually editing the VM configuration ( ) file to remove entries like serial0.fileType = "thinprint" can permanently resolve the error. Advanced vCenter Configuration
If your application (e.g., Cisco emulation, legacy software) actually needs the serial port, you need to map it correctly. If you need serial0 active at boot: The
If you might need the serial port in the future but want to suppress the boot-time error message, you can tell VMware not to connect it automatically.
The error message typically appears in VMware environments when a virtual machine (VM) is configured with a serial port that it cannot properly initialize at startup . This is often a non-critical notification rather than a fatal error, but it can be annoying or indicate a configuration mismatch. Why This Happens
Older GNS3 topologies frequently show this message. GNS3’s integration of Dynamips means that if you add a router but forget to connect the Serial interface via the "Link" tool, you will see this message on boot. If the printer is not needed, you can
Navigate to the folder containing your virtual machine files.
Usually, the "Virtual device serial0 will start disconnected" message has on the performance of your VM. The operating system just boots up without the virtual hardware mapped.