CreateFile() returns ERROR_ACCESS_DENIED opening a device

"I would write a driver that creates a WDF device object. I would then open this device from user-mode and send custom IO control requests" - A typical user-kernel communication scenario. Today, when I was doing this, I hit an issue opening the device in user-mode. I received ERROR_ACCESS_DENIED. User mode application is running with admin … Continue reading CreateFile() returns ERROR_ACCESS_DENIED opening a device