: 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 "Authentication Failure" message on ZKTeco devices typically stems from communication mismatches, sensor obstructions, or firmware licensing issues. Resolving this involves a systematic check of hardware cleanliness, network settings, and software configurations. 1. Hardware and Sensor Maintenance zkteco authentication failure solution best
: ZKTeco devices often use default ports like 4370 (TCP) for proprietary protocols, 3718 for SSH, or 23 for Telnet. Ensure these are not blocked by a firewall. : If a "COM Key" is set on