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At its core, this error means the Virtual Machine settings include a Serial Port hardware device, but the "Backing" (the physical resource it’s supposed to connect to) is missing or busy. Common culprits include:
The VMware error message is a common warning that appears when powering on a virtual machine (VM) in VMware Workstation, Player, or ESXi. While it usually does not prevent the guest operating system from booting, it indicates a configuration mismatch between the virtual hardware settings and the physical host machine.
If you are managing VMs remotely, using ESXi, or prefer editing configuration files directly, you can fix the issue by modifying the VM’s .vmx file.
| 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. |
The message is a warning, not a critical failure. If you don't use serial ports: Remove the port in settings.
Older GNS3 topologies frequently show this message. GNS3’s integration of Dynamips means that if you add a router but forget to connect the Serial interface via the "Link" tool, you will see this message on boot.
: Recent versions of VMware (Workstation 17.5+ and Fusion 13.5+) have removed the ThinPrint virtual printing feature. If your VM was created in an older version, it might still try to initialize a virtual serial port (serial0) specifically for this printer service.
While this warning rarely causes a total system crash or prevents the guest operating system from booting, it adds unnecessary clutter to startup logs and can indicate underlying configuration mismatches. In enterprise environments, resolving these warnings is essential for maintaining clean logs and ensuring that automated monitoring scripts do not trigger false alarms.
The "will start disconnected" warning triggers under three primary scenarios:
If you just powered on your VMware virtual machine and were greeted by the warning "Virtual device serial0 will start disconnected,"
It is a common scenario for VMware Workstation, Fusion, and ESXi users: you power on a virtual machine, and the console alerts you with the message:
If you might need the serial port in the future but want to suppress the boot-time error message, you can tell VMware not to connect it automatically.
At its core, this error means the Virtual Machine settings include a Serial Port hardware device, but the "Backing" (the physical resource it’s supposed to connect to) is missing or busy. Common culprits include:
The VMware error message is a common warning that appears when powering on a virtual machine (VM) in VMware Workstation, Player, or ESXi. While it usually does not prevent the guest operating system from booting, it indicates a configuration mismatch between the virtual hardware settings and the physical host machine.
If you are managing VMs remotely, using ESXi, or prefer editing configuration files directly, you can fix the issue by modifying the VM’s .vmx file.
| 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. | virtual device serial0 will start disconnected
The message is a warning, not a critical failure. If you don't use serial ports: Remove the port in settings.
Older GNS3 topologies frequently show this message. GNS3’s integration of Dynamips means that if you add a router but forget to connect the Serial interface via the "Link" tool, you will see this message on boot.
: Recent versions of VMware (Workstation 17.5+ and Fusion 13.5+) have removed the ThinPrint virtual printing feature. If your VM was created in an older version, it might still try to initialize a virtual serial port (serial0) specifically for this printer service. At its core, this error means the Virtual
While this warning rarely causes a total system crash or prevents the guest operating system from booting, it adds unnecessary clutter to startup logs and can indicate underlying configuration mismatches. In enterprise environments, resolving these warnings is essential for maintaining clean logs and ensuring that automated monitoring scripts do not trigger false alarms.
The "will start disconnected" warning triggers under three primary scenarios:
If you just powered on your VMware virtual machine and were greeted by the warning "Virtual device serial0 will start disconnected," If you are managing VMs remotely, using ESXi,
It is a common scenario for VMware Workstation, Fusion, and ESXi users: you power on a virtual machine, and the console alerts you with the message:
If you might need the serial port in the future but want to suppress the boot-time error message, you can tell VMware not to connect it automatically.