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    Friday, May 03, 2013

    How to get a list of open ports in Linux?

    So you have set up a very secured server but still don't you want to cross check if the machine is really secured and your server has not been compromised by anyone. If is always better to regularly scan your system with open ports and list of connected machines.

    For this blog I will show you the command to get a list of open ports in any machine

    nmap command can be used to do the same. You can download in RedHat machine using yum
    # yum install nmap
    Once installed verify the package
    # rpm -qa | grep nmap

    # nmap <address>

    # nmap localhost
    Starting Nmap 5.51 ( http://nmap.org ) at 2013-09-18 12:04 IST
    Nmap scan report for localhost (
    Host is up (0.0000080s latency).
    Other addresses for localhost (not scanned):
    Not shown: 995 closed ports
    22/tcp open ssh
    25/tcp open smtp
    111/tcp open rpcbind
    631/tcp open ipp
    5989/tcp open wbem-https
    Nmap done: 1 IP address (1 host up) scanned in 0.29 seconds

    Here as you can see I got a long list of opened ports on my machine.
    Go ahead and try the same on your machine.

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    Follow the below links for more tutorials:

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    Red hat Enterprise Linux 5.5 Installation Guide (Screenshots)
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    Why is Linux more secure than windows and any other OS
    What is the difference between "su" and "su -" in Linux?
    What is kernel-PAE in Linux?
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    How to log iptables messages in different log file
    What is virtual memory, paging and swap space?
    Iptables rules to allow/block ssh incoming/outgoing connection in Linux
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