This log shows that your local system has configured for an APIPA range address 169.254.x.x and it is trying to communicate with 192.168.200.x over port 139, which is the Microsoft end-point mapper. Read this CERT article http://www.kb.cert.org/vuls/id/32650 ZoneAlarm Log text: type,date,time,source,destination,transport FWIN,2002/04/11,10:12:00 -7:00 GMT,169.254.101.152:4335,192.168.200.xxx:139,TCP (flags:S) FWIN,2002/04/11,10:13:55 -7:00 GMT,169.254.101.152:4615,192.168.200.xxx:139,TCP (flags:S) FWIN,2002/04/11,10:13:55 -7:00 GMT,169.254.101.152:4618,192.168.200.xxx:139,TCP (flags:S) FWIN,2002/04/11,10:13:55 -7:00 GMT,169.254.101.152:4621,192.168.200.xxx:139,TCP (flags:S) FWIN,2002/04/11,12:59:47 -7:00 GMT,169.254.101.152:4995,192.168.200.xxx:139,TCP (flags:S) FWIN,2002/04/11,12:59:47 -7:00 GMT,169.254.101.152:4998,192.168.200.xxx:139,TCP (flags:S) FWIN,2002/04/11,16:28:38 -7:00 GMT,169.254.101.152:3626,192.168.200.xxx:139,TCP (flags:S) FWIN,2002/04/11,16:28:38 -7:00 GMT,169.254.101.152:3632,192.168.200.xxx:139,TCP (flags:S) As for tools that you can use to monitor such activities, visit: http://www.sysinternals.com for TCPView for your Windows boxes Look here for security tools http://www.cert.org/tech_tips/security_tools.html http://216.60.197.200/Help/Sections/Security.htm http://ciac.llnl.gov/ciac/ToolsUnixNetSec.html http://razor.bindview.com/tools/index.shtml For a list of Security information that I have been able to compile, visit http://www.hudlogic.com/tips.html (security) I haven't heard of Zone Alarm, so I obviously could use some more links on that Security tips location. If you have suggestions, please send them. Kurt Hudson kurt@hudlogic.com