<html><body><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt; color: #000000"><div data-mce-style="color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;" style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;">> I've got a new Yubikey NEO that I am trying to set up for SSH authentication [...] PIN entry works correctly, but after this everything fails with an error 100663404 and returns "signing failed: agent refused operation"<br></div><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><br></div><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;">For closure, this problem has been solved. I had too many PIN failures, so the stick was rejecting further attempts. Resetting the pin counter using gnupg --card-edit, admin, passwd fixed the problem. Now I am able to use my Yubikey and gpg-agent for SSH login.</div><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><br></div><div>LL<br></div></div></body></html>