Another note is that since the Portal was spinned up using the old IP address, when changing the management IP, you might need to rerun "config" (select "I" option) to change the iControl Portal's IIOP/FSSL address to this new IP, so that the Portal can start listening for requests on the new address. Once the new IIOP address is changed, you'll have to restart the Portal and the CORBA servers by:
bigstart shutdown portal
bigstart start portal
bigstart start corbalocallb
bigstart start corbasystem
bigstart start corbanetwork
bigstart start corbamgmt
Hope this helps.
Thanks,
Loc