Problem Resolution:
* After the controller upgrade clients were failing admin authentication
* authentiation was failing with service categorization failure
* found that the controller upgrade has caused NAS port type to change to 0
* before the upgrade NAS port type was 5 and the services was configured for the port type
* but after the upgrade, the port type as changed and that has caused this
* modified the service configuration as per the latest attributes "Less then or equal" to 5 vs "equal to"
* then checked and it is working as expected.
So anyone from the controller team know why the NAS port type was changed in 8.4.0.0 release?