Open a port on Ubuntu 14.04

Question

I have seen similar threads, but they didn't help me.

I am using Ubuntu 14.04.2 LTS (GNU/Linux 2.6.32-042stab108.5 x86_64) on my VPS.

I ran a node.js application on port 9000, but this port is closed, so I can't see my web page using a web browser via the Internet.

My opened ports:

sudo netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      752/apache2
tcp        0      0 0.0.0.0:21              0.0.0.0:*               LISTEN      366/vsftpd
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      454/sshd
tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN      611/master
tcp        0      0 127.0.0.1:27017         0.0.0.0:*               LISTEN      485/mongod
tcp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN      599/mysqld
tcp6       0      0 :::22                   :::*                    LISTEN      454/sshd
tcp6       0      0 :::25                   :::*                    LISTEN      611/master

I was trying to execute the following commands:

sudo iptables -I INPUT -p tcp -m tcp --dport 9000 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 9000 -j ACCEPT

But it didn't help me. Moreover, the /etc/iptables.rules file is missing, so I couldn't save changes using the following command: iptables-save > /etc/iptables.rules

Could you help me please? Thanks.

Solution 1

If you don't see port 9000 with command netstat in listening you app not running or maybe is better to say, your server do not expect connection on that port.

Solution 2

Give this a try

sudo iptables -I INPUT -p tcp -s 0.0.0.0/0 --dport 9000 -j ACCEPT

To make the change permanent

iptables-save > /etc/iptables.conf # Save this changes to file
touch /etc/network/if-up.d/iptables # Create file to call conf from
echo "iptables-restore < /etc/iptables.conf" >> /etc/network/if-up.d/iptables # Add this line to this file
chmod +x /etc/network/if-up.d/iptables  # Make the script executable

Original Source

Comments

[2707974]

If you don't see port 9000 with command netstat in listening you app not running or maybe is better to say, your server do not expect connection on that port.

[Vitone]

And what should I do if my server don't expect connection on that port?

[2707974]

Start app. Do you have any log from app start?

[Vitone]

@2707974, yes, you're right. I tried use another VPS and everything was working well even without opening of additional ports.

[dariush]

The To make the change permanent didn't work for me, but this one did.