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Virtual Device Serial0 Will Start Disconnected _best_ Jun 2026

If you do not require a printer or a serial connection, the simplest fix is to remove the device entirely. the virtual machine. Go to VM > Settings . Select Printer or Serial Port from the hardware list. Click Remove and save the changes. Method 2: Manually Edit the .vmx File

. When the software starts, it tries to initialize the serial port formerly used for ThinPrint, fails because the driver is missing, and displays this warning. Root Cause In previous versions, used a virtual serial port ( virtual device serial0 will start disconnected

| Step | Action | Detailed Explanation | | :--- | :--- | :--- | | | Check Virtual Printer | In VMware, go to VM > Settings and remove the virtual printer or disable "Connect at power on". This directly addresses the most common cause. | | 2 | Inspect Host COM Port | If using a physical serial port, verify it exists in Device Manager (Windows) or as /dev/ttyS0 (Linux) and is not in use by another program. | | 3 | Verify VM Serial Port Path | In VM settings, ensure the path to the serial device is correct. Change from "Auto" to a specific path like /dev/ttyS0 . | | 4 | Check GNS3 Hardware | For GNS3 users: Verify the correct WIC (e.g., WIC-2T) is installed in the router's slot before powering on. | | 5 | Review Network Cabling | For GNS3 users: Ensure one end of the link is a "Serial DCE" cable and, if needed, the DCE side has a clock rate set. | | 6 | Explore Power Management | Rarely, host power management can interfere. In Device Manager, disable power saving for USB Root Hubs and the COM port if present. | If you do not require a printer or

Which are you using? (vSphere ESXi, Workstation, or Fusion?) Select Printer or Serial Port from the hardware list

To stop the warning while keeping the device available, change the startConnected value to false: serial0.startConnected = "FALSE" Use code with caution.

If the GUI doesn't work or you are on an encrypted VM, you can manually "clean" the configuration file.

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