High Automated botnets actively scan the internet for Port 23 (Telnet) and attempt brute-force login using default credential dictionaries. Devices exposed to the public internet are compromised within minutes of deployment.
Find the device's IP address via the on-screen menu ( Comm. > Ethernet ).
The is a hardware platform developed by ZKTeco for biometric access control and time attendance devices. While these devices often have a variety of "default" passwords for different interfaces (like the physical keypad or web panel), identifying the telnet password is often a critical step for system administrators and security researchers. Default Telnet Credentials zmm220 default telnet password
The you are trying to solve via telnet (e.g., forgotten admin password, network error).
Manually pull configuration files that aren't accessible via the standard UI. High Automated botnets actively scan the internet for
Understanding the ZMM220 ZKTeco Terminal: Security and Access
If you discover a ZMM220 on your corporate network with default Telnet credentials, you have a . > Ethernet )
If the device is connected to a cloud server, the telnet port might be restricted by the server's firewall rules. Common Uses for Telnet Access