A: In VMware Workstation, you cannot suppress warnings globally. The only way is to connect the port to a valid target (file or pipe) or remove it.
To stop the warning while keeping the device available, change the startConnected value to false: serial0.startConnected = "FALSE" Use code with caution.
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 warning is completely harmless.
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 device serial0 will start disconnected
If you need serial0 to start , override the default by specifying:
If you ignore this message while building a serial link, you will pull your hair out troubleshooting the interface. You will type show ip interface brief and see:
Change the connection type to "Output to file" to save serial data to a .txt or .log file.
| Interface Status | Line Protocol Status | Typical Cause | Recommended Action | | :--- | :--- | :--- | :--- | | Administratively down | down | Interface has been manually shut down. | Enter interface config mode and use the no shutdown command. | | down | down | Physical layer problem, e.g., no cable, faulty hardware, or no power from remote device. | Check physical connections, try swapping cables, and verify the remote device is powered on. | | up | down | Data link layer problem, common causes include a missing clock rate on the DCE side or mismatched encapsulation protocols. | Verify which side is DTE/DCE and set the clock rate if necessary. Check the encapsulation (e.g., HDLC or PPP). | | up | up | Interface is operational. | - | A: In VMware Workstation, you cannot suppress warnings
The "virtual device serial0" error is rarely a "broken" VM; it’s just a mismatch between virtual hardware and physical reality. By removing the port or disabling the "Connect at power on" toggle, you can return to a seamless, one-click boot process.
environments and indicates that a virtual serial port cannot find its intended hardware or software backend during power-on
EVE-NG handles this more elegantly, but the principle is the same.
This error is common in VMware Workstation, Player, and ESXi environments. It usually indicates that the virtual machine is configured to use a serial port, but that port cannot connect to the intended backend (such as a physical port on the host, a named pipe, or a file) at the time of booting. If you think you might need the port
Is the serial port by an application inside the VM? Share public link
Method 1: Disconnect or Remove the Serial Port (Recommended)
Most modern users and operating systems do not require a serial port. Removing it is the cleanest way to stop the error message. the Virtual Machine.
If you are a VMware user, you might have encountered the warning message: during virtual machine (VM) startup or while checking the status of your VM.