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How to open TCP port in Ubuntu 10.10 ?
How to open TCP port in Ubuntu 10.10?
Answers
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sudo iptables -A INPUT -p tcp --dport (port number) -j ACCEPT
zengr
Posted 2010-10-13T07:43:40.157
Reputation: 1 334
No,no. I need to open port in system, for application like torrent client or apache server. – None – 2010-10-13T07:47:41.253
@Romka no no, thats not how you ask a question, more info needed, this answer is correct – SSH This – 2013-01-23T22:37:08.473
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Shooting in the darkness:
sudo ufw allow 80
Now there is a rule in your ubuntu firewall allowing external access to your 80 port. If you want more specific rule see man ufw. If you are on non-routable IP address you have to forward port in your router. If you provide more context to your question, then I can adjust this answer.
Casual Coder
Posted 2010-10-13T07:43:40.157
Reputation: 3 614
2This doesn't work under Ubuntu 12.10... nmap localhost -p80 still displays CLOSED – weberc2 – 2013-01-11T23:31:52.150
sudo ufw enable would be required first on a default Ubuntu install, since ufw is disabled by default. – Chris Moschini – 2014-04-08T04:07:16.410
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Your question needs a lot more detail:
- What do you mean by "open a port"? Do you want to do it in a program? Just run a program?
- What is your network configuration? LAN structure, Internet uplink, OSes involved, which router/switch...
- Do you have any firewalls / NAT in place? On your system, elsewhere in the network?
That said, if you have the "typical" home setup (one or more computers hooked up to a combined switch/router with Internet uplink via DSL or cable): Typically the switch/router/modem combo has a built-in firewall. You'll probably need to open a port there. Usually these devices have a web interface for configuration, look into your manuals.
sleske
Posted 2010-10-13T07:43:40.157
Reputation: 19 887
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I suggest Netcat: The very basic way to do that (via Netcat) is:
nc -l <port_number>
Example:
nc -l 12569
Ruel
Posted 2010-10-13T07:43:40.157
Reputation: 411
Belongs either on http://superuser.com or http://askubuntu.com.
– BoltClock – 2010-10-13T07:45:27.2431For what do you want to open the port? To host a service? to use for outgoing traffic? What do you want to achieve? – S.Hoekstra – 2010-10-13T08:07:09.733