Microsoft Windows [Version 6.0.6001] (C) Copyright 2006 Microsoft Corp. c:\windows>netsh ras diagnostics set cmtracing ?
set cmtracing [ state = ] ENABLED|DISABLED
Enables or disables logging for Connection Manager service profiles.
state - tracing state for Connection Manager service profiles.
ENABLED - Enables logging for Connection Manager service profiles.
DISABLED - Disables logging for Connection Manager service profiles.