[Snort-users] Snort 2.6.1 false negative - not detecting port scans

Hari Sekhon hpsekhon at ...14012...
Fri Jun 13 05:59:18 EDT 2008


   I have a couple of snort sensors with the sfportscan preprocessor 
enabled and set to sensitivity high with no ignored scanners and have 
then proceeded to test this using nmap to do the most standard syn and 
connect scans directly against those sensors and snort has failed on 
both sensors to detect this.

I am outputting to both syslog and base via barnyard and no portscan 
alerts have been logged, nor has the unified alert file grown at all, so 
snort is definitely not logging this. I am sure snort was logging this 
before the other day when I was testing this.

Any ideas why snort is failing such a basic test?


Hari Sekhon

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