I understand this has been solved but wanted to add a few details of my experience for whomever might follow me in finding this thread. My environment involves Cisco 2960s and 2960x switches 2fa using RADIUS proxy to Duo. The pain points for me wer...
The stack module was my problem as well thank you. I pulled the module the switch booted successfully then I was able to reinsert the module reboot the switch and it now works as expected.
