The detectiscsistorageportcandidate command found a new controller with no existing established connections after the maximum of 64 iSCSI controllers was reached.
Use the management GUI or the lscontroller command to view the list of managed controllers. Identify any controllers that you no longer need to manage. Remove the mdiskgroups that are composed of mdisks that were exported from the identified controller. Use the rmiscsistorageport command to remove the unused iSCSI port. After the lscontroller command shows fewer than the maximum of 64 controllers, retry the command to discover the new controller. Also, consider how you might consolidate iSCSI storage onto fewer controllers.