: If a "COM Key" is set on the device, the same key must be entered into the software settings. A mismatch here will result in an immediate connection failure. 3. Software and Firmware Fixes
The most common cause of failed biometric recognition is a physical barrier between the user and the sensor. zkteco authentication failure solution best
If the "Authentication Failure" occurs while trying to connect the device to management software, it is likely a network handshake issue. : If a "COM Key" is set on