Every developer knows there are some utilities that are completely indispensable from their workflows. The programmer’s toolbelt, if you will. These toolbelts are usually different from person to person, but if there is one tool that everyone should use or at least know how to use, it is tcpdump. If you are unfamiliar, tcpdump is a tool that allows you to dump and inspect live network traffic being observed on a network interface.
In around 2003 I worked as a level one tech for a very large customer contact center (1,500 call center agents) for a major American hardware vendor. This was around the height of adware and other greyware hitting Windows XP.