This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
we have 9 windows servers & 2 linux that talk to each other and to outside servers too (they talk to around 110 external ports as we have many clients and when a user does some actions we need to talk to 1-3 apps)
but a lot of communication is internal too - encrption, db, services