How To Check Open Ports In Fortigate Firewall Cli?

How to Check Open Ports in Fortigate Firewall CLI

In today’s interconnected world, it’s more important than ever to secure your network from unauthorized access. One of the most important steps in network security is to ensure that all ports are closed that are not needed. This can be a daunting task, but it’s essential to do if you want to protect your network from attack.

Fortinet firewalls are a popular choice for businesses of all sizes, and they offer a variety of features to help you secure your network. One of these features is the ability to check which ports are open on your firewall. In this article, we’ll show you how to check open ports on a Fortigate firewall using the CLI.

We’ll start by explaining what a port is and why it’s important to secure them. Then, we’ll walk you through the steps to check open ports on your Fortigate firewall using the CLI. Finally, we’ll provide some tips on how to secure your ports and protect your network from attack.

What is a Port?

A port is a logical connection point between two devices on a network. Each port has a unique number, and each type of traffic uses a specific port number. For example, HTTP traffic uses port 80, and HTTPS traffic uses port 443.

When you connect to a website, your computer sends a request to the website’s server on port 80. The server then sends back a response, which is also sent on port 80. This process is repeated for each request and response.

Ports can be either open or closed. An open port means that traffic is allowed to pass through it, while a closed port means that traffic is blocked.

Why is it Important to Secure Ports?

By default, all ports on a firewall are closed. This means that no traffic is allowed to pass through the firewall unless it’s specifically allowed. This is a good security practice because it prevents unauthorized access to your network.

However, there are some ports that you need to open in order to allow certain types of traffic. For example, if you want to access the internet, you need to open port 80 and 443.

It’s important to only open the ports that you need and to close all other ports. This will help to protect your network from attack.

How to Check Open Ports on a Fortigate Firewall using the CLI

Checking open ports on a Fortigate firewall is a relatively simple process. To do this, you’ll need to use the CLI (command-line interface).

1. Log in to your Fortigate firewall.
2. Type the following command:

diag sys net port-info

This command will display a list of all the ports that are open on your firewall.

3. To get more information about a specific port, use the following command:

diag sys net port-info

For example, to get more information about port 80, you would use the following command:

diag sys net port-info 80

This command will display the following information:

• The port number
• The protocol (TCP or UDP)
• The state of the port (open or closed)
• The source and destination addresses
• The source and destination ports

Tips for Securing Your Ports

Here are a few tips for securing your ports:

• Only open the ports that you need.
• Use strong passwords for your firewall accounts.
• Keep your firewall software up to date.
• Use a firewall that offers intrusion prevention and detection (IPS/IDS) features.

By following these tips, you can help to protect your network from attack.

Column 1	Column 2	Column 3
Step 1	Log in to the Fortigate firewall CLI	$ ssh fortigate_user@fortigate_ip
Step 2	Use the `diag net show port` command to list all open ports	diag net show port
Step 3	Use the `diag net show proto` command to list all open protocols	diag net show proto

The FortiGate firewall is a powerful network security appliance that can be used to protect networks from a variety of threats. The FortiGate CLI (command-line interface) provides a way to configure and manage the firewall from the command line. This can be useful for advanced users who need to perform specific tasks that are not available through the web-based interface.

One of the most common tasks that administrators need to perform is checking which ports are open on the firewall. This can be done using the `show firewall interface` command. This command will list all of the interfaces on the firewall, along with the ports that are open on each interface.

Overview of Fortigate Firewall CLI

The FortiGate CLI is a powerful tool that can be used to configure and manage the firewall. It is a text-based interface that allows you to enter commands and view the output. The CLI is divided into several different modes, each of which allows you to perform different tasks.

The following are the main modes of the FortiGate CLI:

• System mode allows you to configure the general settings of the firewall, such as the hostname, time zone, and logging settings.
• User mode allows you to create and manage user accounts.
• Network mode allows you to configure the network interfaces and routing.
• Security mode allows you to configure the firewall policies and intrusion prevention system (IPS).
• VPN mode allows you to configure the VPN tunnels.
• Application mode allows you to configure the application control policies.
• Reporting mode allows you to view reports on the firewall activity.

How to Check Open Ports on the Fortigate Firewall CLI

There are several ways to check which ports are open on the Fortigate firewall CLI. The following are three of the most common methods:

1. Using the `show firewall interface` command
2. Using the `show firewall policy` command
3. Using the `diag sniffer packet` command

Using the `show firewall interface` command

The `show firewall interface` command will list all of the interfaces on the firewall, along with the ports that are open on each interface. To use this command, type the following at the CLI prompt:

show firewall interface

The output of this command will look similar to the following:

Interface Status Protocol IP Address/Mask MAC Address Description
—————————– —— ——– ————– ————— ————–
port1 up up 10.10.10.1/24 00:0c:29:5d:03:34 eth0
port2 up up 172.16.10.1/24 00:0c:29:5d:03:35 eth1

In this example, the ports 10.10.10.1/24 and 172.16.10.1/24 are open on the firewall.

Using the `show firewall policy` command

The `show firewall policy` command will list all of the firewall policies, along with the ports that are allowed through each policy. To use this command, type the following at the CLI prompt:

show firewall policy

The output of this command will look similar to the following:

Policy ID Protocol Source Destination Action Description
———————– ——– ——– ——– ——– ——–
1 tcp any any allow Allow all TCP traffic
2 udp any any allow Allow all UDP traffic

In this example, all TCP and UDP traffic is allowed through the firewall.

Using the `diag sniffer packet` command

The `diag sniffer packet` command can be used to capture packets on the firewall and view the ports that are being used. To use this command, type the following at the CLI prompt:

diag sniffer packet port

where `` is the port number that you want to capture packets for.

The output of this command will show the packets that are being sent and received on the specified port.

The FortiGate CLI is a powerful tool that can be used to configure and manage the firewall. It is a text-based interface that allows you to enter commands and view the output. The CLI is divided into several different modes, each of which allows you to perform different tasks.

There are several ways to check which ports are open on the Fortigate firewall CLI. The three most common methods are using

How to Check Open Ports in Fortigate Firewall CLI

The Fortigate Firewall CLI provides a number of commands that can be used to check for open ports. The following are some of the most common commands:

• show config firewall port – This command will display a list of all the open ports on the firewall.
• show status firewall tcp – This command will display a list of all the TCP ports that are currently open on the firewall.
• show status firewall udp – This command will display a list of all the UDP ports that are currently open on the firewall.

In addition to these commands, you can also use the following tools to check for open ports:

• nmap – Nmap is a free and open source network scanner that can be used to scan for open ports on a network.
• tcpdump – Tcpdump is a free and open source packet capture tool that can be used to capture network traffic and view the open ports on a device.

Once you have identified the open ports on your Fortigate Firewall, you can then take steps to secure them. For example, you can create a firewall rule to block access to the port or you can implement a VPN to restrict access to the port.

Troubleshooting Open Ports on the Fortigate Firewall CLI

If you are having trouble finding the open port, there are a few things you can do to troubleshoot the issue.

• Check the spelling of the command. Make sure that you are typing the command correctly.
• Try using a different command. There are a number of different commands that can be used to check for open ports. Try using a different command to see if you can get a different result.
• Check the firewall configuration. Make sure that the firewall is configured to allow access to the port.
• Check the network configuration. Make sure that the network is configured to allow access to the port.

If you are still having trouble finding the open port, you can contact Fortigate support for help.

What to do if you’re not sure what the open port is for

If you are not sure what the open port is for, there are a few things you can do to find out.

• Check the firewall logs. The firewall logs will show you which applications are using the open port.
• Contact the application vendor. The application vendor may be able to tell you what the open port is for.
• Search the internet. You can search the internet for information about the open port.

Once you know what the open port is for, you can then take steps to secure it. For example, you can create a firewall rule to block access to the port or you can implement a VPN to restrict access to the port.

What to do if you’re not sure how to close the open port

If you are not sure how to close the open port, there are a few things you can do.

• Use the CLI. You can use the CLI to close the open port. To do this, use the following command:

config firewall port
edit set status disable
end

* **Use the web interface.** You can also use the web interface to close the open port. To do this, follow these steps:

1. Log in to the Fortigate Firewall web interface.
2. Click on **Firewall** > Ports.
3. Click on the Edit button next to the open port.
4. Uncheck the Enable checkbox.
5. Click on Apply.

• Contact Fortigate support. If you are still having trouble closing the open port, you can contact Fortigate support for help.

Additional Resources

• [Fortigate Firewall CLI documentation](https://docs.fortinet.com/document/fortigate/6.4.0/cli-reference/522617/firewall)
• [Fortigate Firewall forums](https://forum.fortinet.com/)
• [Fortigate Firewall support website](https://support.fortinet.com/)

In this article, we have discussed how to check open ports in the Fortigate Firewall CLI. We have also provided troubleshooting tips for finding open ports that you are not sure about. Finally, we have provided resources for additional information on this topic.

Q: How do I check open ports on a Fortigate firewall using the CLI?

A: To check open ports on a Fortigate firewall using the CLI, follow these steps:

1. Log in to the Fortigate firewall CLI.
2. Type the following command:

diag sys net show tcp

This command will display a list of all TCP ports that are currently open on the firewall.

3. To view the status of a specific port, use the following command:

diag sys net show tcp

For example, to view the status of port 80, you would use the following command:

diag sys net show tcp 80

Q: What do the different columns in the output of the `diag sys net show tcp` command mean?

A: The columns in the output of the `diag sys net show tcp` command show the following information:

• Port: The TCP port number.
• Proto: The protocol (TCP or UDP).
• State: The state of the port (open, closed, filtered, or listening).
• Local Address: The local IP address and port number of the connection.
• Remote Address: The remote IP address and port number of the connection.
• Packets: The number of packets that have been sent or received on the port.
• Bytes: The number of bytes that have been sent or received on the port.

Q: How can I close a port on a Fortigate firewall using the CLI?

A: To close a port on a Fortigate firewall using the CLI, follow these steps:

1. Log in to the Fortigate firewall CLI.
2. Type the following command:

config firewall port
edit set status disable
end

This command will disable the specified port.

3. To save your changes, type the following command:

write

Q: How can I open a port on a Fortigate firewall using the CLI?

A: To open a port on a Fortigate firewall using the CLI, follow these steps:

1. Log in to the Fortigate firewall CLI.
2. Type the following command:

config firewall port
edit set status enable
end

This command will enable the specified port.

3. To save your changes, type the following command:

write

In this blog post, we have discussed how to check open ports in Fortigate firewall CLI. We first introduced the basic concepts of Fortigate firewall CLI and then provided detailed steps on how to check open ports using the CLI. We hope that this blog post has been helpful and that you have learned how to check open ports in Fortigate firewall CLI.

Here are some key takeaways from this blog post:

• The Fortigate firewall CLI is a powerful tool that can be used to manage and configure the firewall.
• To check open ports in Fortigate firewall CLI, you can use the following command: `sudo netstat -anp | grep `.
• The output of this command will show you the status of all ports on the firewall, including whether they are open or closed.
• You can also use the `show firewall status` command to get a summary of the firewall’s status, including a list of all open ports.