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: The most common reason in modern versions of VMware Workstation (17.5+) and VMware Fusion (13.5+) is the removal of the ThinPrint virtual printing feature . These newer versions no longer support the ThinPrint protocol, which often utilized serial0 .

If you are a hardcore Dynamips user on Linux, you can edit the .net file directly. Change this:

: The VM is set to connect to a physical COM port on your host machine that does not exist or is currently being used by another application.

The error message "Virtual device serial0 will start disconnected" typically occurs in

(often required for Windows 11 due to TPM), you may not be able to edit the file directly as it is encrypted . In these cases, the warning may persist until