Ubuntu

How to open ports in ubuntu

Asked by Phillip

Need to open ports 110 - pop, 25 - smtp and 143 - imap .. did a scan and said ports are closed need to open to configure thunderbird for webmail not seeing ports opened.

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Jim Hutchinson (jphutch) said : 		#1

How did you do a scan? These are standard ports and are open but only when something is listening. Your router/modem probably uses NAT (http://en.wikipedia.org/wiki/Network_address_translation) to hide them from a normal outside scan.

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Stephenson (k-admin-ubunto-tstephenson-com) said : 		#2

I also need to open ports 111, 25 and 143 to run a server as a non-root user. The ports are open if run as root, they are not available to a non-root user by default. I can open port over 1000 for this but I would prefer to run using the normal ports.

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David Ally (david-ally) said : 		#3

Depending on your setup, if your firewall is blocking the ports from outside, you may need to open them with

sudo iptables -A INPUT -p tcp --dport (port number) -j ACCEPT

replace port number with the service port number.

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