Save the file and reload your VMware application before booting the VM. Summary and Prevention
If you are an embedded developer or network engineer requiring the serial port for debugging:
To understand the fix, you must understand the hardware. virtual device serial0 will start disconnected
After this, show ip interface brief still shows Serial0 down/down .
Click . Now, anything the VM sends to the serial port will be recorded in that file without triggering a connection error. Still seeing the error? Save the file and reload your VMware application
Virtual Device Serial0 Will Start Disconnected - Google Groups
If you are running ESXi and the warning appears alongside a license restriction, check your current vSphere license: Virtual Device Serial0 Will Start Disconnected - Google
Emulating unplugged hardware:
Each of these configurations has its own potential failure points, and the error message can point to issues in any of them, depending on the context.
: Ensure the correct serial WIC (like a WIC-2T) is installed in the appropriate slot on the router before you power it on and attempt to create links.