Syncthing install Ubuntu 20.4
curl -s https://syncthing.net/release-key.txt | sudo apt-key add -
echo "deb https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list
sudo apt-get install apt-transport-https
sudo apt-get update
sudo apt-get install syncthing
sudo apt install daemonize
For WSL 2: (issue in admin Powershell)
netsh interface portproxy add v4tov4 listenport=22000 listenaddress=0.0.0.0 connectport=22000 connectaddress=xxx.xxx.xxx.xxx
netsh interface portproxy add v4tov4 listenport=21027 listenaddress=0.0.0.0 connectport=21027 connectaddress=xxx.xxx.xxx.xxx
connectaddress from ip addr in WSL 2. Open both ports for UDP and TCP in Defender.