A commonly overlooked cause is the VMware "Virtual Printer" feature, which uses a serial port internally.
: When connecting two routers via their serial interfaces, ensure you have selected the correct cable type. Use the "Manual" cable connection and pick a "Serial DCE" cable for the device that will provide clocking. virtual device serial0 will start disconnected
Sometimes the GUI settings don't stick. You can manually force the device off in the configuration file. Navigate to your VM's folder. Open the file with Notepad. Look for the line: serial0.present = "TRUE" Change it to: serial0.present = "FALSE" Save and restart VMware. When Should You Worry? A commonly overlooked cause is the VMware "Virtual