Yubico Forum

I assume you are trying to do this in a Windows environment with PIV smartcards.

Follow this:
https://developers.yubico.com/yubico-piv-tool/

Read all tutorials in the webpage.

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-Tom

Thanks very much Tom. That looks like just what I need. I may not be able to return to this for a couple of weeks, but once I've had time, I'll come back and post step-by-steps for this particular case, for other Yubikey NEO beginners like myself. (I'm a crypto old hand, but rather rusty; it was back in the late 1990s/ early 2000s that I was working with PKIs and smartcards!)
cheers,
-Jay

Thanks sorry your root post and users were deleted due to spam we had on the 13th october night EU time.

Happy you re-registered!

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-Tom

Aha! That explains it. I knew I'd completed the registration the first time, and couldn't quite square it in my head why I had to re-register today.
(I headed security for an on-line games company a little while back, and forum hacks, spam blasts, etc were an on-going pain in the <Bleep>. Sorry you had to suffer one recently).

Thanks, it was our fault we tried to disable logon with Yubikeys.

You can read more here:
viewtopic.php?f=25&t=1487

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-Tom