The ASA 5500x series (other than the 5585x) uses the management 0/0 port on the ASA itself as the port it uses to communicate with the network.
You have to have the management port up in order to reach the IPS sensor management IP, but you don’t necessarily have to have an IP address on the ASA m0/0 port itself.
For example, this configuration works fine:
ASA Management Interface
interface Management0/0 nameif management security-level 100 no ip address
IPS Management Interface
service host network-settings host-ip 172.16.0.251/24,172.16.0.1
Just something to maybe save someone a few minutes…
For those impatient people among us (me included) …just a note in case anyone is searching for this…it appears that it takes roughly 10 minutes for an IPS sensor in an ASA 5525x to upgrade.
I must’ve killed it two or three times after 5 minutes or so thinking there was a problem…there wasn’t. Awesome.