A: Surprisingly, yes. A restart clears temporary buffer overflows. Do this weekly via a timer socket.
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: 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. A: Surprisingly, yes
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Avoid using DHCP, which can change the device's IP and break the connection to the server. Manually assign a static IP.