Virtual Device Serial0 Will Start Disconnected [Top 100 PRO]

In ESXi environments, this warning may be connected to licensing. An ESXi user once wrote: "When guest machine starts up, there is a warning message in ESXi logs: 'Virtual device serial0 will start disconnected' and there is Error Stack message saying: 'The currently available license does not permit the use of remote serial ports.'" This happens because remote (network‑backed) serial ports require an Enterprise or Enterprise Plus license on many vSphere editions; the free edition or a lower‑tier license cannot activate that feature.

host, and do you actually need to print from within your virtual machine? virtual device serial0 will start disconnected

The resolution depends on your specific needs and configuration: In ESXi environments, this warning may be connected

If you want the port active but connected to nothing (to suppress the warning), you must trick VMware into thinking it has a valid backing: The resolution depends on your specific needs and

Virtual machines use virtual hardware definitions to mirror physical computer components. When a VM is configured with a virtual serial port (COM port), VMware attempts to map that virtual port to a resource on your physical host machine during the boot sequence.