Little Snitch v2.0.2 Little Snitch helps prevent these and other improper actions of malicious programs.
This wonderful Miss at every attempt of a program to show network activity gives the user query. The user can authorize (Allow) or deny (Deny) program, or go online to connect to the local network.
Barring (or settlement) may be one time (once), to exit (until ... quits) or pozhiznenym (forever).
For each application Little Snitch creates its own rules (Rules) - specifies the port, protocol and the server on which the network is permitted or prohibited activity.
For one application may be few.
Of course Little Snitch can block or allow any program (any) network activity.
Rules can add, delete, edit and clone by clicking on Yovenko in System Preferences -> Little Snitch.