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Old 02-08-2008, 08:44 AM   #1
Registered: Oct 2006
Location: The Ether
Distribution: Ubuntu 16.04.7 LTS, Kali, MX Linux with i3WM
Posts: 299

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How to open and close ports on command line ?

Hello there,
I have no firewall installed on a linux box and after running nmap have found that there are three open ports

[root@PCLOS2007 ~]# nmap

Starting Nmap 4.20 ( ) at 2008-02-08 14:25 GMT
Interesting ports on PCLOS2007 (
Not shown: 1694 closed ports
22/tcp  open  ssh
139/tcp open  netbios-ssn
445/tcp open  microsoft-ds
AS I am not running iptables etc, just for curiosity's sake,
what would be the best way to open and close ports via command line ?
One could edit the inetd.conf file but this is becoming redundant in a lot of Linux flavours.
I would like to open port 79 so that I can finger from another machine.Is there a manual way of opening / close this port or is the port opened by the finger daemon at start-up ?

Thanks again,


Last edited by uncle-c; 02-08-2008 at 08:52 AM.
Old 02-08-2008, 10:23 AM   #2
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Registered: Nov 2004
Location: San Jose, CA
Distribution: Ubuntu
Posts: 8,507

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An "open" port is created by the service running on that port performing the listen() call to listen for incoming requests.


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