On a fresh installation of El Capitan I was able to get my Yubikey up and running using the following guide:
https://www.yubico.com/wp-content/uploa ... -Login.pdfHowever, there were a couple of bumps in the road, that needs to be addressed. I documented how these were resolved in the attached document. But... a slight hiccup.
If you require the Yubikey to be inserted in order to be able to login back in from screensaver mode, it will immediately require you to enter your UserID and Password a second time. And suggestions on how to fix this?