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To get a list of the most commonly open ports on your system,you can use thenmap commandwith the 鈥?F鈥?flag: [email protected]:~$sudo nmap -F localhost TCP ports can be scanned on the system using nmap by just adding the 鈥?T鈥?flag,along with the nmap command:

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  • Do you know which ports of your Ubuntu system are open?

  • We鈥檒l also see how to use Ubuntu鈥檚 ufw firewall to make sure ports are secure. So, do you know which ports of your system are open? Let鈥檚 find out. Privileged access to your Linux system as root or via the sudo command. The ss command can be used to show which ports are listening for connections.

  • How do I check for listening ports on Ubuntu Linux?

  • In this guide, we saw how to use the ss command, as well as the nmap utility to check for listening ports on Ubuntu Linux. We also learned how to check ufw firewall to see what ports are open, and add exceptions if necessary.

  • How do I get a list of open ports on Linux?

  • To get a list of the most commonly open ports on your system, you can use the nmap command with the 鈥?F鈥?flag: TCP ports can be scanned on the system using nmap by just adding the 鈥?T鈥?flag, along with the nmap command: Similarly, for UDP ports, you can use the 鈥?U鈥?flag with the nmap command:

  • How do I see what ports are open on my System?

  • The ss command can be used to show which ports are listening for connections. It also shows which networks it鈥檚 accepting the connections from. We recommend using the -ltn options with the command to see concise and relevant output. Let鈥檚 look at an example on our test system.