why is this an invalid packet

From: H. S. (g_reate_xcalibur_at_yahoo.com)
Date: 01/26/05 

Date: Tue, 25 Jan 2005 19:07:06 -0500

I am logging the dropped invalid packets by my iptables script. I get
quite a bit in my log file (a few lines every hour):

Jan 25 15:24:29 red kernel: Invalid Outgoing IN= OUT=eth0
SRC=192.168.0.2 DST=194.109.137.218 LEN=52 TOS=0x00 PREC=0x00 TTL=64
ID=306 DF PROTO=TCP SPT=44797 DPT=80 WINDOW=25884 RES=0x00 ACK PSH FIN
URGP=0

How can I determine why this packet was determined to be invalide. The
rule to check invalid state comes after the rules allowing lo traffic
and allowing packtes related to realplayer.

Thanks,
->HS 

-- 
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