we have a problem with CNA (Cisco Network Assistent 5.3) and Cisco ASA 5520 (OS 7.3). Other devices like Switches were detected correctly by CNA, only the ASA not. HTTPS-Access is available and ASDM works friendly too.
Perhaps since the firewalls don't support CDP you need to enter them manually. The user guide reads:
"Beginning with the IP address for a starting device and the port numbers for the HTTPS and HTTP protocols, Network Assistant uses CDP to compile a list of community candidates that are within four CDP hops of the starting device"
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