Virtual Device Serial0 Will Start Disconnected Today
: The .vmx configuration file contains parameters for serial0 that the hypervisor cannot process, such as an invalid file type or destination. How to Fix It Method 1: Disable Virtual Printing (Recommended)
Another application on your host computer is already using the serial port.
The message "virtual device serial0 will start disconnected" is a benign informational log from virtualization software (commonly QEMU/KVM, VirtualBox, or libvirt) indicating that a virtual serial device (named serial0) is configured but will not be connected to a host endpoint at VM start. It does not by itself indicate an error but explains why a guest serial port is inactive; troubleshooting depends on whether this was intentional. virtual device serial0 will start disconnected
For a serial link to function, one side must be a DCE (Data Circuit-terminating Equipment) and the other a DTE (Data Terminal Equipment). The DCE side is responsible for providing the clocking signal to the DTE side. In a lab environment, when two routers are connected back-to-back with a serial cable, one router must act as the DCE. If the DCE side is not configured with a clock rate , the line protocol will remain down. You can determine which role an interface is playing using the show controllers serial0 command.
Change to:
Depending on your needs, you can either remove the device entirely or reconfigure it to clear the error. Option 1: Remove the Printer Device (Recommended)
Locate the folder where your VM files are stored and find the file. Open it with a text editor (like Notepad). Find and delete the following lines: serial0.fileType = "thinprint" serial0.fileName = "thinprint" serial0.present = "TRUE" Save the file and restart the VM. Method 3: Disable "Connect at Power On" It does not by itself indicate an error
The error message in VMware (Workstation or Fusion) most commonly occurs because support for ThinPrint (virtual printing) has been discontinued in recent versions like Workstation 17.5 and Fusion 13.5 . Primary Fixes Remove the Printer Device (Easiest Method): Shut down the virtual machine. Go to VM Settings > Hardware tab. Select the Printer device and click Remove . Click OK and restart the VM.
The serial port is configured to log output to a text file (e.g., serial.log ), but the destination path is invalid, read-only, or locked by another process. In a lab environment, when two routers are
