Question:

MassTransit reports "The hardware key has been removed", but my dongle is plugged in. What should I do?

Answer:

USB dongles occasionally stop responding. This behavior will result in repeated "The hardware key has been removed" messages when MassTransit is running, or "The hardware key could not be found" when trying to launch MassTransit.

To solve this problem, first ensure that your dongle is properly plugged in to a working port. If you still have this problem, reboot your machine. In all known cases, restarting the machine will allow the dongle to be recognized.