Lower the threshold value slightly (e.g., from 45 to 35) to make the scanner less restrictive.

Poor initial enrollment is the leading cause of ongoing authentication failures. Log into the device menu as an . Navigate to User Mgt. > Manage . Select the problematic user and choose Edit . Delete the old fingerprint template.

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Incorrect time settings can cause logs to fail if they conflict with the server time. C. Resolve "Network Error" during Authentication

The device rejects alphanumeric codes entered via the keypad. Phase 2: Common Causes and Immediate Fixes 1. Environmental and Physical Sensor Issues

Need a specific model guide? Leave your ZKTeco model number (e.g., K40, SF1000, FaceDepot 790) in the comments for a tailored troubleshooting checklist.

The Definitive Guide to Fixing ZKTeco Authentication Failures

For high-traffic or harsh environments (like manufacturing plants or construction sites), combine facial recognition with RFID cards. This provides a reliable alternative when physical hand wear prevents fingerprint scanning.

Ensure the user's specific profile isn't locked into an incorrect mode (e.g., requiring both Card + Fingerprint when they are only using a fingerprint). 4. Hardware and Power Supply Faults

When a user is enrolled multiple times or old data was corrupted during a transfer, the device gets confused.

Avoid direct sunlight or extreme backlight on the machine. Low light environments can also cause failures.

Different ZKTeco generations require different tactics.

If user-specific fixes do not work, the problem may lie in the device configuration.

Avoid using long, unshielded extension cables that cause voltage drops.

The first and most tangible frontier in solving authentication failures is the hardware itself. ZKTeco devices rely on optical sensors, capacitive sensors, or infrared cameras to capture biological data. Over time, these sensors are susceptible to physical degradation.