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I have a fingerprint device attached to a LAN and I want to figure out the port number used. I could not figure out from its settings and configuration, so I thought to do a port scan over the network. Are usual port scanners able to identify and communicate with such a device? I tried Advanced Port Scanner and Zenmap GUI and neither helped, Adv Port Scanner does not see the device and Zenmap identifies it as 'Host down'.

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You can use zenmap, which is a full-featured nmap GUI. It has predefined scan types, including some to scan for remote OS based on certain signature/behavior found during the port scan.

EDIT: I see you already used zenmap without success. Be sure to enable "operating system detection" (see here for an image)

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If the device is on the LAN it will have an ip address, and you can use NMAP to scan for open ports on that address.

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