How to open or close a port in VPS?

I Forgot · Jun 29, 2016

Are there any way(s) to open or close a port in VPS?

I am using Putty program. Thanks

ZenHosting · Jun 29, 2016

Hi there,

What distro and firewall are you using?

If you're using CSF, open the csf.conf file and go to TCP_IN and you'll see the lists of ports that are open.

You can check if the port is open / closed, by entering the IP address of the server and port number, using this website: http://www.yougetsignal.com/tools/open-ports/

Hope that helps!

Luxin Host · Jun 29, 2016

I Forgot said:
Are there any way(s) to open or close a port in VPS?

I am using Putty program. Thanks

All the ports should already be open. which OS are you using?

I Forgot · Jun 29, 2016

ZenHosting said:
Hi there,

What distro and firewall are you using?

If you're using CSF, open the csf.conf file and go to TCP_IN and you'll see the lists of ports that are open.

You can check if the port is open / closed, by entering the IP address of the server and port number, using this website: http://www.yougetsignal.com/tools/open-ports/

Hope that helps!

If I don't use CSF then is there a way to do that in SSH?

Luxin Host said:
All the ports should already be open. which OS are you using?

Normally I use Linux and install Centos 6 on it.

Does it have any difference to check ports on different OS?

Luxin Host · Jun 29, 2016

I Forgot said:
Normally I use Linux and install Centos 6 on it.
Does it have any difference to check ports on different OS?

For a simple example, lets look at bittorrent. Bittorrent uses the tcp protocol on port 6881, so we would need to allow all tcp packets on destination port (the port on which they arrive at our machine) 6881:

# Accept tcp packets on destination port 6881 (bittorrent)
iptables -A INPUT -p tcp --dport 6881 -j ACCEPT

Here we append (-A) a rule to the INPUT chain for packets matching the tcp protocol (-p tcp) and entering our machine on destination port 6881 (--dport 6881).

Note: In order to use matches such as destination or source ports (--dport or --sport), you must first specify the protocol (tcp, udp, icmp, all).

We can also extend the above to include a port range, for example, allowing all tcp packets on the range 6881 to 6890:

# Accept tcp packets on destination ports 6881-6890
iptables -A INPUT -p tcp --dport 6881:6890 -j ACCEPT

Source: https://wiki.centos.org/HowTos/Network/IPTables#head-cdc2ff6985016368c04d0b37a5914eef2e8d5796

Let me know if this doesnt work then we can do more checks

HostPace · Jun 29, 2016

I Forgot said:
Are there any way(s) to open or close a port in VPS?

I am using Putty program. Thanks

Open port XXX for example:

Open flle /etc/sysconfig/iptables:

# nano /etc/sysconfig/iptables

Append rule as follows:

-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport XXX -j ACCEPT

Save and close the file. Restart iptables:

# /etc/init.d/iptables restart

If you want to close / remove any particular port, simply remove the line of code for example above.

Verify that port is open

Run following command:

# netstat -tulpn | less

Make sure iptables is allowing port connections:

# iptables -L -n

How to open or close a port in VPS?

I Forgot

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