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Assuming you only want to check if a server listens for network connections on a particular TCP or UDP port (without actually exchanging application-level data with that service), then this is how to instruct NMIS to do that:

• Select Service Type port
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• Give the appropriate port and protocol in the form of udp:123 (that would be NTP) or tcp:22 (that's SSH)
• Ignore Service Name and all program-related settings

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