Tag Archives: GPO

Block instant messengers using GPO

A customer want to block users to run any instant messagers except Skype, but he does not have a good proxy server. Here is my quick and dirty solution.

open the GPO for the domain
expand User Configuration > Administrative Templates > System
on the right pane, right-click Don’t run specified windows application
click Enable > Show
Add the folllowing programs to the list
* msnmsgr.exe (MSN Live Messenger)
* msmsgs.exe (Windows Messenger)
* aim.exe
* ypager.exe (Yahoo Messenger)
* yupdater.exe (Yahoo Messenger Updater)
* icq.exe

wait 90 minutes for effective (default GPO refresh interval on 2000/XP is 90 minutes)