Isolate all biometric, time-attendance, and IoT hardware onto a dedicated, non-routable Virtual Local Area Network (VLAN).
Therefore, there is no "default" public password. The telnet service is, by design, a back-end engineering tool, not an administrative feature for end-users.
Many embedded platforms leave diagnostic ports open by default during manufacturing. In standard ZMM220 platform deployments, network scans might reveal an active Telnet listening service on or custom administrative ports like Port 10086 . zmm220 default telnet password
Regularly backup device configurations to quickly restore operations in case of a failure or after an unauthorized change.
Because these devices are essentially small Linux-based computers, they run an embedded operating system. System administrators may want to access this OS via Telnet or serial connection for several legitimate reasons: Extracting raw user data or logs. Modifying localized wallpaper or audio files. Many embedded platforms leave diagnostic ports open by
Shipping a product with the ZMM220 reference design?
Ensure the biometric device is not exposed directly to the internet. Isolate all biometric
If none of the above work, you can often find the password hidden in the device's configuration backup: Export Config:
The skeleton key.