Hello.
We extensively tested the ZeroTier functionality in multiple scenarios and we haven't got such behavior. Indeed I'm writing you now from a PC connected to a RUT240 + Zerotier Enabled with no problem.
You can follow the link below to get more instructions about how the Functionality is implemented
https://wiki.teltonika.lt/view/ZeroTier_One_VPN_configuration
Can you please restore the device to factory settings and install the Zerotier Package again?
Keep in mind that some times Zerotier servers take a while to update the connection after the device reboots.
Also. keep in mind that sometimes the ZerotierServers closes the connection of some devices if it doesn't send information after 120 seconds.
You can force the device to send and thus keep the Zerotier enabled by using this User Script. Use it in the client and server devices. Please remember substitute the IP in the example with the Zerotier Server IP or the IP of any other device in your same Zerotier Network.
https://wiki.teltonika.lt/view/RUT240_User_Scripts
#!/bin/ash
while [ 1 ]; do
ping 10.147.17.225 -c 3 -q >/dev/null
ret=$?
if [ $ret -ne 0 ]; then
/etc/init.d/zerotier restart
fi
sleep 60
done
If the problem persists please reach out to your Sales Manager and provide a troubleshoot file and a TCP dump file to track further why is presenting such behavior.