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

Seth sethsec at ...11827...
Wed Jun 18 16:08:03 EDT 2008

Where is the scan being run from?  Same subnet?  Behind a firewall?

You mention you are doing the scan against the sensors. Are you
scanning the sensor MGMT IP address or the network that the sensor is



On Fri, Jun 13, 2008 at 5:59 AM, Hari Sekhon <hpsekhon at ...14012...> wrote:
> Hi,
>   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?
> -h
> --
> Hari Sekhon
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