Comodo Firewall


I run Win XP with two users logged on & usually hibernate to cut start up times. I often notice what looks like a traffic red stop sign, that is a red circle with a diagonal red line through it, over the Comodo system tray icon. The only way to get rid of it is to restart the computer, although logging off then on may work. The firewall says all systems are up & running? What does the red sign mean?