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Rafael Hernández
Asked: 2020-11-09 13:26:54 +0800 CST 2020-11-09 13:26:54 +0800 CST

I can't disable services or close ports in ubuntu

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I have scanned my network with nmap.

Host is up (0.000047s latency).
Not shown: 1995 closed ports
PORT     STATE         SERVICE
25/tcp   open          smtp
68/udp   open|filtered dhcpc
631/udp  open|filtered ipp
5353/udp open|filtered zeroconf
5355/udp open|filtered llmnr

with sudo /etc/init.d/zeroconf disable I don't get anything.

With gufw I have created the rules to close ports 5353 and 5355 but they are still open.

What I can do?

xubuntu

1 Answers

  1. Best Answer

    I would recommend you to use the following firewall.

    UFW (Uncomplicated Firewall)

    It is the one I use and it has worked correctly for me, and easy to use.

    Facility:

    root@linux:~# apt-get install ufw

    Turn on event logging

    root@linux:~# ufw logging on

    Enable access via SSH

    root@linux:~# ufw allow ssh/tcp

    Activate the firewall

    root@linux:~# ufw enable

    Check the status of the firewall

    root@linux:~# ufw status verbose

    enter image description here

    Block ports 5353 and 5355

    root@linux:~# ufw deny 5353
root@linux:~# ufw deny 5355

    enter image description here

    I leave you a link so you can verify a little more about its use. UFW Walkthrough

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