What mean the flags UFRIO,UIOB, etc? That appear when type sh conn of PIX.
#sh conn
TCP out 1.2.3.4:80 in 2.1.4.5:2615 idle 0:06:12 Bytes 1591 flags UFRIO
TCP out 10.165.32.73:1055 in 10.10.218.166:1494 idle 0:00:49 Bytes 189025 flags UIOB
Where can I find more information?