My new best friend: netstat -b
A few days ago, the network interface on my system ground to a halt. The arp and netstat commands suggested something strange might be going on, but I really needed to correlate the network connections with the system processes. I then discovered the -b flag for netstat (on Windows XP) which does exactly this, and helped me to isolate the problem.
More information on netstat and the -b flag is available here > http://commandwindows.com/netstat.htm
Tags: security