Changing certain values on the Sensor, like the Sensor's name or Sensor IP address, require you to "break trust" between the Sensor and the Manager before you make the change, and then re-establish the communication with the Manager. Essentially, the Manager knows the Sensor by a specific set of information; if you want to change any of it, you must re-establish the communication with the Manager.
Changing any of these values requires you to "break trust" with the Manager:
Sensor name
Note
Changing a Sensor's name requires you to delete it from the Manager and re-add it, or in other words, re-configure the Sensor from the beginning. For instructions, see Add the Sensor to Manager and then Configuring the Sensor.
Sensor shared secret
Manager IP
Sensor IP and subnet mask