If your issue persists, please tell me the and whether it's failing on a fingerprint, face, or card scan , so I can provide a more tailored troubleshooting step. Examining an Authentication Problem with WiFi - Portnox
Sometimes the device authenticates the finger perfectly, but the server rejects the user due to a communication error disguised as "Authentication Failure."
Click to push clean data from the server back to the physical device. Fix Overlapping User IDs
Dry skin lacks the contrast needed for optical scanners. Breathe on your finger or use lotion.
If the failure happens for specific users during fingerprint or facial scans, the issue lies in template quality. Fingerprint Verification Issues zkteco authentication failure solution best
This article offers the in 2026, ranging from simple hardware checks to advanced software troubleshooting and administrator resets, ensuring your systems are fully operational. 1. Quick & Common Fixes (80% of Cases)
In some cases, the error is triggered by license verification or corrupted system files. How to Fix ZKTeco Authentication Error on Biometric Devices
Comprehensive Troubleshooting Guide for ZKTeco Authentication Failures
The user should stand within the recommended range ( ) and look directly at the camera [1]. If your issue persists, please tell me the
: If you are locked out of the device settings as an administrator, you may need to perform a factory reset using a time-based method or a physical tamper switch on models like the F18 . Troubleshooting Checklist
Place the center of the fingerprint on the sensor, applying firm, consistent pressure. Avoid tilting or shifting the finger [3].
For devices connected to a network or PC, authentication can fail due to communication problems. ZKTeco devices default to using port 4370 for TCP/IP communication, so ensuring this port is open is a critical first step in any network troubleshooting.
If accessing the device from a different network, ensure port 4370 (default UDP) or the configured ADMS port is open. 💻 Software & Data Synchronization Breathe on your finger or use lotion
Dry skin struggles to register minutiae points. Moistening the finger slightly or rubbing it against the forehead for natural oils can instantly resolve scanning failures.
Best practices (preventive)
To find the , we must systematically eliminate these variables.
If user-specific fixes do not work, the problem may lie in the device configuration.
ZKTeco periodically releases firmware that updates the matching algorithm.