In order to analayze it, you would need a sniffer or protocol analyzer to take a look at the traffic destined for the machine as already mentioned by Networker. Your degree of understanding of networking will probably determine what tool you use. Ethereal uses a GUI for you to interact with. Also, there are tools like tcpdump/windump and snort - which is also an Open Source IDS that could help you to pick up and identify attacks like these (if it was an attack, of course) more efficiently. There are also a few personal firewalls that pick up and block the attacks. I think that BlackICE does this.