The following Technical Document addresses moving your Nimsoft Installation:
TEC000002587 : Moving the Nimsoft Installation
This document strongly advises against changing the IP address or name of the hub, but does not explicitly state that you cannot make these changes. The document is also centered on moving the primary hub. For the most part, these instructions are applicable for a secondary hub as well.
Depending on network subnets the robots should eventually discover the new hub – this may take several minutes. If robots fail to automatically reconnect you will need to either edit the robot.cfg file on each robot, specifying the new hub IP address, or use the Connect Robot function from the Tools menu in Infrastructure Manager.