It's EVERYWHERE... like a virus.
Adobe uses Apple's Bonjour service also known as
mDNSResponder.exe to communicate with the mother ship. More about Bonjour here. Adobe transfers things like licensing, usage, and error data. They also run a service called
armsvc.exe which is the Adobe Acrobat Update Service that also calls home to check for updates periodically. Adobe has a video about how to remove mDNSReponsder on their TV site.
If you're running a Creative Suite on your server (not likely, but not unheard of) you'll also get traffic from different plug-ins in various apps that connect to web services, also anything that uses the Creative Cloud will also likely transfer data and try to authenticate a license, as well as all web programs like Dreamweaver, Muse, and Flash obviously.
If this is a Windows box, you can use sysinternals process explorer to check for different running apps and the company name of the owner of the process. If it's a Mac server then you can open activity monitor to see what's running, in addition to
top via command line.