There is no native way to block calls to show_channels, but IIS offers request blocking functionality that can serve this purpose:
FoxWeb Support Team
Sent by Martin Martin on 06/18/2012 04:36:11 PM:
How can I hide this screen from everyone?
for example ,
if I type :
it show me all the running channel on this server
you can also see each script executed.
how can I block this?