Uncomplicated FireWall application preset

Installation

Please note: When you installed syncthing using the official deb package, you can skip the copying.

Copy the file syncthing to your ufw applications directory usually located at /etc/ufw/applications.d/. (root permissions required).

In a terminal run

sudo ufw app update syncthing

to load the preset. To allow the syncthing ports, run

sudo ufw allow syncthing

You can then verify the opened ports

sudo ufw status verbose