Debian Stretch 9 Test if Port is Open
Hi! This Tip shows you How to List Open Ports in Debian Stretch 9 GNU/Linux.
And the Debian Stretch 9 Check if Port is Open is achieved by the Nmap Network Tool.
Finally, Nmap (Network Mapper) is a Security Scanner, originally written by Gordon Lyon (also known by his pseudonym Fyodor Vaskovich), used to discover hosts and services on a computer network, thus building a “Map” of the network.
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1. Opening Shell Session
Open a Shell Terminal emulator window
(Press “Enter” to Execute Commands)
In case first see: Terminal QuickStart Guide.
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2. Installing Nmap
Then Install Nmap Tool with:
sudo apt install nmap
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3. Listing Open Ports
Finally, to List All Open Ports.
sudo nmap -sT -O localhost
And in the Output you should find a detailed List of the Open Ports:
