How To: Ubuntu Linux Firewall Open Port Command

How do I open port 80 and 443 on a Ubuntu Linux LTS version 14.04 server?

Ubuntu Linux server comes with firewall configuration tool called ufw (Uncomplicated Firewall). It is the default tool. ufw is very easy to use and configure host based firewall settings. This program is for managing a Linux firewall and aims to provide an easy to use interface for the user. For example:[donotprint][/donotprint]

  1. You can open/close ports.
  2. Block an IPv4/IPv6 address.
  3. Delete existing firewall rules.
  4. Turn on or off firewall logs.
  5. And more.

How do I see the current status of my firewall?

Type the following command:
sudo ufw status verbose
Sample outputs:

Fig.01: Check the status of UFW on a Ubuntu Linux

How do I open tcp port # 22?

To allow incoming tcp packets on port 22, enter:
sudo ufw allow 22/tcp
Verify it:
sudo ufw status verbose

How do I open tcp port # 80 and 443?

The service specific syntax is as follows to open http and https service ports:
sudo ufw allow http
sudo ufw allow https

sudo ufw allow 80/tcp
sudo ufw allow 443/tcp

How do I open tcp and udp port # 53?

To allow incoming tcp and udp packet on port 53, enter:
sudo ufw allow 53
Verify it:
sudo ufw status verbose

Advanced examples

To allow IP address access to port 22 for all protocols
sudo ufw allow from to any port 22
Open port (SSL 443 nginx/apache/lighttpd server) for all, enter:
sudo ufw allow from any to port 443 proto tcp
To allows subnet to Sabma services, enter:
ufw allow from to any app Samba
You can find service info as follows:
sudo ufw app list
Sample outputs:

Available applications:
  Nginx Full
  Nginx HTTP
  Nginx HTTPS

To get information on Squid profile/app, run:
ufw app info Squid
Sample outputs:

Profile: Squid
Title: Squid proxy cache
Description: Internet object cache (WWW proxy cache)

See ufw command man page for more info.

Posted by: SXI ADMIN

The author is the creator of nixCraft and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.


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