You have a Serial Port added to your VM settings, but your actual laptop or desktop doesn't have a physical COM port. Conflict with Host Drivers:
To improve boot performance and prevent unnecessary I/O delays, serial0 (the primary virtual serial device) now starts in a by default. The serial interface will only become active after an explicit connection is established by the user or guest OS. virtual device serial0 will start disconnected
| Platform | Typical Reason | | :--- | :--- | | | The serial port is set to "Use named pipe" or "Use output file", but the other end (e.g., a debugger like WinDbg) hasn't connected yet. | | VirtualBox | Serial port is enabled with "Port Mode" set to "Disconnected". | | GNS3 / EVE-NG | The virtual router or switch has a serial interface (e.g., serial0/0 ), but it's not linked to another device's serial interface via a cable. | | QEMU | The -serial option is used without a backend (e.g., -serial null or -serial unix:/path,server=off ). | You have a Serial Port added to your
A student attempted to build a Frame Relay switch using a Cisco 3640 in GNS3. After configuring the Frame Relay map statements and inverse ARP, the PVCs remained inactive. The student spent six hours checking DLCI numbers and encapsulation types. | Platform | Typical Reason | | :---
In the VM settings, go to the section and uncheck Connect at power on . This will stop the system from checking for the resource every time it starts. Why this happens with Printers