Hello,
In general this means that the device is not connected to the VPN.
Do you know if there might be restrictions on the device’s network?
Do you have an online device on the same network?
I was trying to test my node-red flow that handles data logging on a USB, and if the USB isn’t connected it saves the data on the SD card. I got the USB part working, but it was when I tried to data log to the SD that the device went offline. I’ve since managed to revert back so that it only writes to the USB incase this was the issue. My device has now just came back online so I think it was an issue with my flow.
It may have been, however, the flow was using a couple of “file-lister” nodes that appeared to cause the node-red to constantly restart if they couldnt see the file they were looking for - this caused a different pi4 to crash that was running standard raspbian so I’ve taken them out the flow and it seems to have solved this issue too.