fwknop-gui software package provides FireWall KNock OPerator Graphical User Interface, 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 fwknop-gui
fwknop-gui is installed in your system.
Make ensure the fwknop-gui package were installed using the commands given below,
$ sudo dpkg-query -l | grep fwknop-gui *
You will get with fwknop-gui package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | fwknop-gui |
| Version | 1.3+dfsg-1 |
| Description | FireWall KNock OPerator Graphical User Interface |
| Sub Section | Net |
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