.. md_log_behavior.rst

.. _md-log-behavior-label:



=============================
Logging Minidriver Behavior
=============================

Should errors occur in the use of the YubiKey as a PIV Smart Card with YKMD, error logging can be enabled on the local computer using the registry. Once enabled, log files are created per running process in ``C:\Logs``. See `Smart Card Basic Troubleshooting <https://support.yubico.com/hc/en-us/articles/360015654900-Smart-Card-Basic-Troubleshooting>`_ for additional troubleshooting steps.

 • Key: ``HKEY_LOCAL_MACHINE\SOFTWARE\Yubico\ykmd``
 • Value: ``DebugOn`` (DWORD) - ``1`` enables error logging.

.. Note:: Refer to :ref:`md-config-registry-label` for additional registry settings.