Three times today I have received a pop-up from ZA (security suite version 6.5.737.000, windows XP Home, networked) saying it has blocked an attempt to connect to Port 139 (which I think is for file-sharing) from IP 192.168.0.3 which is the IP address of this computer (my others are 192.168.0.2 and 192.168.0.4).
I ran a full anti-virus and spyware scan with ZA, also Spybot S&D, and AdAware and found nothing unusual (mainly cookies and "last-opened-file" lists).
Any ideas why I'm getting this message?
thanks in advanceliz

Operating System:Windows XP Home Edition
Product Name:ZoneAlarm Internet Security Suite
Software Version:6.5