Disconnected [hot] | Virtual Device Serial0 Will Start

If the GUI settings do not stick, or if you are managing a "Headless" VM (no graphical interface), you must edit the configuration file directly.

Some VM templates or quick-creation wizards add a serial port by default but leave it disconnected. This is common in Linux VM templates that include a legacy console serial port that may not be needed. virtual device serial0 will start disconnected

This is very common for network emulation users. GNS3 often links virtual routers to VMware VMs via named pipes for console access. If the GUI settings do not stick, or

For more persistent issues, or if the "Printer" device doesn't appear in the GUI, you can manually clean the configuration file as suggested by Broadcom Knowledge Base . This is very common for network emulation users

You cloned a VM from an older template that included serial hardware by default. How to Fix "Serial0 Will Start Disconnected"

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.