For many students, this message triggers an instinct to panic. Is the router broken? Is the image corrupted? Will Serial0/0 ever come up?
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.
In the Hardware tab, scroll down and look for (it may be labeled Serial Port 1 or Serial 0 ). Select the Serial Port entry. virtual device serial0 will start disconnected
in the vCenter Server's advanced settings can help maintain connections. Impact on Operations In most cases, this message is a non-critical warning
If you want to keep the device for occasional use but stop the error message at startup: Go to . Select the Serial Port hardware. Uncheck the box for "Connect at power on" . For many students, this message triggers an instinct
This is very common for network emulation users. GNS3 often links virtual routers to VMware VMs via named pipes for console access.
The “Virtual device serial0 will start disconnected” message is a common informational warning that appears in various VMware products. It is not an indication of VM corruption or permanent failure, but rather a notification that the VM’s virtual COM port was unable to establish a connection during startup. Will Serial0/0 ever come up
: For users of VMware Fusion or advanced users, manually editing the VM configuration ( ) file to remove entries like serial0.fileType = "thinprint" can permanently resolve the error. Advanced vCenter Configuration
VMware displays this message when a virtual serial port (COM port) is enabled in the VM configuration, but the physical host resources it points to are missing, disconnected, or busy. The most common triggers include:
The configuration requires an output file or socket that is not reachable. Solutions for the "Serial0" Error
: Another application or virtualization service on the host may be using the COM port that the VM is trying to occupy.