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charlie
Asked: 2013-05-10 21:02:28 +0800 CST

How to open a particular port in ubuntu?

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My SoulSeek client Nicotine+ checks my open ports during initial configuration and promts that the one port number it needs is closed, cutting me off frmo about 50% of the users. Is there anyway I can open that particular port for the application to use?

RUnning ubuntu desktop 13.04. I have not manually installed any firewalls, but not sure if its included in the default installation.

13.04

2 Answers

  1. Run this on the commandline; it should solve issue: sudo iptables -A INPUT -m conntrack --ctstate NEW,RELATED,ESTABLISHED -j ACCEPT

    To do a specific port:

    sudo iptables -A INPUT -p <tcp OR udp> <--dport OR --sport> <port> -j ACCEPT

    INPUT is the chain for incoming traffic. -p is protocol (either tcp or udp --dport or --sport specify allowing for destination or source port. -j is "jump" and its where you ACCEPT, REJECT, or DROP the packet(s)

    Details on iptables can be found by reading the man page. Since you're a beginner you'll probably find this useful: http://www.netfilter.org/documentation/HOWTO//packet-filtering-HOWTO.html

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  2. You need to install at least one firewall, because it's not installed in default installation on ubuntu.

    for 32 bits
    - Firestarter
    for 64 bits
    - Firestarter

    • Install and open the firestarter, add the inbound policy with this ip:   0.0.0.0/0   (to allow all ip addresses)
    • Add the ports that you need to open.
    • Then click on apply the changes button.
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