Snort not logging port scans

["Abe Froman" <abe__froman () hotmail com>]

I ran(from another machine on a different network)
nmap -sS 45.9.3.115
nmap  45.9.3.115
nmap -O 45.9.3.115

But the port scan log is empty
# ll /var/log/portscan.log
-rw-r--r--    1 root     root            0 Dec 28 22:22 
/var/log/portscan.log

even through i added
preprocessor portscan: 45.9.3.0/24 5 7 /var/log/portscan.log

# preprocessor flow: stats_interval 0 hash 2
preprocessor portscan: 45.9.3.0/24 5 7 /var/log/portscan.log
# frag2: IP defragmentation support

and started snort by running
./snort -de -l ./log

Got any tips?

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