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If you’re a hard-core system administrator and you want to get your feet wet using a kernel debugger, this option is for you!

The kernel is a program that is one of the first to run when your server boots (the kernel loads right after the bootloader); it has total control over everything on your system.

Debugging Mode turns on kernel debugging, which allows you to work with the kernel debugger to examine states and processes that are running at the kernel level. This can be very useful for troubleshooting issues with device drivers that cause the infamous blue screen of death and issues with the central processing unit (CPU). You can look at the kernel memory dump on the system that is having the issue, or you can view the kernel memory dump remotely on another system via a serial connection. The information from the Debugging Mode is typically made available over the COM1 port (assuming you have a serial port and it’s assigned to COM1). On newer systems that don’t have a serial port, you can also access this information over USB.

Kernel debugging is not for the faint of heart. For more information on how to set up your system for kernel debugging with either serial or USB connectivity, check out the following articles:

 Serial connection: https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/setting-up-a-null-modem-cable-connection

 USB connection: https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/setting-up-a-usb-3-0-debug-cable-connection

COM ports were typically presented as serial ports with RS-232 connectors on older systems. On newer systems, these have been replaced with USB ports. USB stands for Universal Serial Bus — it’s still a serial connection.