Note About Changing ASA 5505 Subnet

When working with an ASA 5505, if you change the ip address of the internal interface to a different subnet, make sure you enable http access to the new subnet or you won’t be able to use the Cisco ASDM interface anymore. Command: http 192.168.0.0 255.255.255.0 inside.

Networking Cisco ASDM ASA