I have been noticing what ISA is calling "port scan attacks" for the past week or so from the same IP address. I am just getting my feet wet with trying to monitor security closely and don't mean to sound like a complete idiot. (Oops! To late?) Does this mean someone is purposely scanning my ISA server for holes or could it be something non intentional? Is there really anything that can be done about it? I have already found out who owns that block of ip addresses provided the source address is not being spoofed. Does Tom's book cover questions about what the different log messages mean? Thanks! Jeb