This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
One can install a sniffer in the network between the both machines and read all sent/received bytes. In for example a proxy, firewall, router or even your own machine. SSL encrypts those bytes before sending and decrypts them before reading.