How to resolve error 51 in Mountain lion ?

Since I have updated my OS to 10.8 I am not able to connect the VPN . It is showing me error 51 . How to restart VPN connectivity.

OK, check this one:
/Library/Preferences/System/Configuration/preferences.plist
and see if it's locked. If not, try moving that file out to the desktop. You'll need to reset a number of preferences, but that seems to be where OS X 10.8 is keeping that setting now.
Regards.

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