Resuming Scans

I'm trying to figure out exactly how the knowledge base works. Below are my
current settings. If I launch a scan and then kill it half way through, I
can re-launch the scan and it skips over the addresses already scanned
picking up where the scan was stopped. I can then look at the output file
and have a complete report.

If I launch another scan on the same hosts before the kb_max_age expires,
the scan doest not run. I end up having a blank output file. Here I would
thing the output file would be that of the last valid scan. I have to
delete the files in the knowledge base directory or lower the kb_max_age in
order for the scan to run.

Is this how it is supposed to work? Is there any documentation that
explains how this works?


.nessusrc settings:

save_knowledge_base =  yes
only_test_hosts_whose_kb_we_dont_have = no
only_test_hosts_whose_kb_we_have = no
kb_restore = yes
kb_dont_replay_scanners = yes
kb_dont_replay_info_gathering = yes
kb_dont_replay_attacks = yes
kb_dont_replay_denials = yes
kb_max_age = 864000



 
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