I need to use a HHS PIV card to remotely access computer systems from a brand new Macbook air running OS X 10.10 Yosemite. Still – consider the Centrify software if you don’t want to spend $29. Still no idea why this is happening – on other versions of OS X my smart card credentials transparently passed onto the OS. Long story short: It works to get past the VPN gateway but throws the same “no valid certificates found” error when trying to login to the Windows desktop via a Citrix Receiver client. I just had a chance to test the new Yosemite 10.10 compatible free SmartCard utility from Centrfy mentioned here: The bulk of this post concerns the $29 Pkard product from Thursby which is the first I found with explicit OS X 10.10 support. If this is bothering or interesting you, you may want to monitor this URL: There is an active Citrix support thread on the “no valid certificates found” issue. Note: This entire post is basically google search bait designed to (hopefully) allow others struggling with the same issues to save a bit of time. Using PIV smart cards for HHS VPN login with Mac OS X 10.10 Yosemite