Users can log into the Managment Console for Unix (MCU) with their AD accounts and can perform all the functions that do not require AD credentials (such as profiling systems and installing QAS). However anything that does require AD permissions (such as joining a system to a domain) fails.
Users can still SSH to the system and join via the command line, it is just joining/unjoining via the MCU GUI that fails. This problem started after upgrading the MCU from version 2.0.1 to 2.5.1
Defect ID #28609 has been created to track this problem. Waiting for fix in a future release