The .vmx configuration file stores every setting for a VM, including all serial port definitions. Corruption or inconsistencies can result from an abrupt shutdown of VMware, an incomplete upgrade, or manual editing errors. Even a small syntax error can prevent the serial port from being properly enumerated. In some cases, the serial port configuration references a non‑existent physical device or uses incorrect parameters that VMware cannot resolve. Backing up the .vmx file before making any changes is an essential safety measure.
If you do not need a serial port, either remove the device from the VM hardware configuration or set serial0.present = "FALSE" in the .vmx file. This eliminates unnecessary warnings and reduces complexity. virtual device serial0 will start disconnected
The warning can be triggered by a number of different scenarios. Pinpointing the exact cause in your environment is the crucial first step. In some cases, the serial port configuration references
Suddenly, the screen changed. The underscore stopped blinking. Serial0: Connection established. This eliminates unnecessary warnings and reduces complexity
Since the most common cause is the deprecated ThinPrint service, removing the virtual printer often stops the message. the virtual machine. Go to Virtual Machine Settings . Look for Virtual Printer in the device list. Select it and click Remove . Restart the VM to see if the message persists. Method 2: Manually Edit the .vmx File