Not need to use sniffer and it's hard to understand w/o technical knowledge.
In dos (Start -> Run -> Cmd), do a "netstat -ano" and it will list all the network connection w/ it's process ID. Then open Task Manager (right click on yr taskbar -> Task manager), View -> "select column" -> check "PID" and it will show all the process w/ it's ID. Then you will find out what program/process is listening for traffic.
My SE X1 rom-> http://forum.xda-developers.com/forumdisplay.php?f=471