New in the portal is the ability to remotely reboot a LiveU Solo:
The portal will ask if you are sure, and once you verify you are, the unit will start a reboot sequence. First, it counts down 5 seconds to warn a local operator that the reboot will occur, then it reboots.
Of course, the unit must first be "online" meaning the unit itself must have some working connection to the internet.
Once the unit completes its full boot and re-connects to the internet, you will again see it in Solo Portal.