How to turn off the linux system firewall

Turn off Linux Firewall: Install UFW (if not installed). Use sudo ufw disable to disable the UFW firewall. Use sudo ufw status to verify that the firewall is turned off. Use sudo ufw status | grep to check the status of a specific port. If the output is empty, the port is closed.

Turn off the Linux system firewall

To turn off the Linux system firewall, use the following steps:

1. Install UFW

If UFW is not installed, please install it first. UFW is a lightweight firewall, easy to use:

<code>sudo apt-get install ufw</code>

2. Disable UFW

Use the following command to disable UFW firewall:

<code>sudo ufw disable</code>

3. Verify Firewall Status

To verify that the firewall is down, run the following command:

<code>sudo ufw status</code>

The output should look like this:

<code>Status: inactive</code>

4. Check port status

To check if a specific port is closed, use the following command:

<code>sudo ufw status | grep <端口号></code>

For example, to check if port 22 is closed, run:

<code>sudo ufw status | grep 22</code>

If the output is empty, the port is closed.

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