Most of times all you have to do is make user all 3 messages are Green, your user is selected and Harvest is Turn on, But some times a couple issues could happen, That's a quick troubleshoot.
IF THERE IS A "NAN TRANSPORT IS STOPPED" RED MESSAGE
So the Service is stopped, If you don't have sudo permissions ask NMRFAM IT to help you, otherwise just use the command: sudo systemctl restart data-transport-daemon.service
IF THE NDTS GUI IS STCUK OR FROZEN
If you don't have sudo permissions ask NMRFAM IT to help you, otherwise just use the command:
ps aux | grep wish
Find the process number: ex. travula+ 7280 0.2 0.0 180128 6020 ? Sl Oct07 26:07 wish /opt/nan-dtdaemon/nan_gui.tcl