Security event log "Logon/Logoff - Anonymous Logon"

From: Nasarene (anonymous_at_discussions.microsoft.com)
Date: 03/19/04 

Date: Fri, 19 Mar 2004 06:26:05 -0800

I have a home network in which I share folders and drives. I've recently begun using broadband, and just checked my security event for the first time. I noticed numerous successfull logon/logoff by "anonymous logon" at times that I wasn't loging on or off. I had not checked this prior to getting broadband.

Does this mean that someone or some program is logging onto my system in some way? And if so, is there a way to prevent this from occurring?

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