If your virtual machine does not require a serial connection, the cleanest solution is to remove the device entirely. the virtual machine completely. Right-click the VM in your library and select Settings . Go to the Hardware tab. Select Serial Port (or Serial 0 ) from the device list. Click the Remove button at the bottom of the window. Click OK to save changes and restart the VM. Method 2: Disable "Connect at Power On"
Ensure the box is checked only if the target file or pipe is configured correctly. Click OK to commit the settings. Fixing the Error via the .VMX Configuration File virtual device serial0 will start disconnected
: In a real Cisco router, a serial link requires a DCE (Data Communications Equipment) side to provide a clock signal. In GNS3, this is often not necessary. However, GNS3 may fail to create a link if both ends of a serial cable are not set up correctly. The software requires that one end is designated as DCE, which can be set within the GNS3 interface. Some have noted that GNS3 serial links operate differently from physical hardware and may not need a clock rate configured. If your virtual machine does not require a
The virtual port is mapped to a physical COM port on your host computer (e.g., COM1cap C cap O cap M 1 Go to the Hardware tab
If the VM was created on a host with specific hardware (like a serial port) and moved to a host without one, this error occurs.
Virtual machines use virtual hardware definitions to mirror physical computer components. When a VM is configured with a virtual serial port (COM port), VMware attempts to map that virtual port to a resource on your physical host machine during the boot sequence.
| Goal | Action | | :--- | :--- | | | Remove the Serial Port device in VM Settings. | | Keep Functionality | Ensure the output file path/pipe name is correct and the destination exists. | | GNS3 Users | Start the GNS3 topology before starting the VM. |
