We use smartcard authentication for RDP sessions - but via a Windows guest VM on our OS X hosts. But in El Capitan (GM), the smartcard is not passing through to the VM, so we cannot log in. Console entries around the failures on the OS X side read:
com.apple.SecurityServer: token in reader OMNIKEY AG CardMan 3121 cannot be used (error 229)
I checked the HID site, and they have some newer beta software for this particular reader (released 9/4/2015), but it won't install on OS X 10.11. Anyone else seeing any similar issues?