Hi everybody, I'm having the same problem and found the following steps to reproduce:
0. Configure your Yubikey NEO to eject the card on button press: ykneomgr -M81 Re-plug it afterwards! 1. Insert the Yubikey and press button to insert the (virtual) card 2. Use the authentication key stored on the card to log in to a SSH host 3. Press button to remove the (virtual) card (or wait if you have a timeout for auto-eject configured) 4. Press button to insert the (virtual) card again 5. Do anything that requires the card (e.g. gpg -d) gpg: public key decryption failed: Conflicting use Instead of having the SSH session still open, it suffices to have a persistent connection (ControlPersist ssh config option). Apparently, even an authenticated SSH session somehow still uses the agent (even without agent forwarding configured), and if the card was removed and re-inserted, this somehow blocks its usage. So instead of restarting the gpg-agent, you can also kill all open ssh sessions. Best regards, Jan-Philipp Litza
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