How to open firewall port in ubuntu?

@viola_gleichner 

To open a firewall port in Ubuntu, you need to use the ufw (Uncomplicated Firewall) command line tool. Here are the steps to open a port in Ubuntu using ufw:

1. Open a terminal window by pressing CTRL + ALT + T on your keyboard.
2. Type the following command to list the current status of your firewall:

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sudo ufw status

1. If your firewall is inactive, you can enable it by typing the following command:

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sudo ufw enable

1. To open a port, you can use the following syntax:

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sudo ufw allow <port number>/<protocol>

For example, to open port 80 for HTTP traffic, you can use the following command:

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sudo ufw allow 80/tcp

1. You can verify that the port has been opened by typing the following command:

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sudo ufw status

This will show you a list of the current firewall rules, including the rule you just added to open the port.