firewall-applet software package provides panel applet providing status information of firewalld, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install firewall-applet
firewall-applet is installed in your system.
Make ensure the firewall-applet package were installed using the commands given below,
$ sudo dpkg-query -l | grep firewall-applet *
You will get with firewall-applet package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | firewall-applet |
| Version | 0.4.3.3-1 |
| Description | panel applet providing status information of firewalld |
| Sub Section | Net |
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