I've done packet sniffing when not behind a firewall, using a fixed IP address which is very seldom used, and found my unit hit with a port scan from outside in less than a minute. If you're running an application which leaves a port open, that can be found and exploited. On Sun, 15 Jun 2003, Tarik Bilgin wrote: . . . > > Is there any way that someone can gain access to our PowerBooks when > > we are online without our approval? I have always assumed that such > > was not possible, but I am not dreaming. > > it totally depends what applications you are running. Yes, there are > applications you can run which will give people certain access to > services on your Powerbook. > > The most simple of these are: ftp service, web service, ssh service, > smb (windows file sharing) service, which can all b e switched on and > off in the sharing pane of Sys Prefs. . . .