kppp configure question

[Mike Adolf <madolf@dialup4Less.com>]

I would like to use kppp (in KDE) to establish an internet connection. When I 
execute it, as root, I get the following:

Xlib: connection to ":0.0" refused by server
Xlib: Client is not authorized to connect to Server
kppp: cannot connect to X server :0.0

What is it telling me?  How do I authorize kppp?

Thanks,
mike