Very Computer

With Red Hat 6.2, when I try to use kppp under
mwm from an xterm as a non-root user, I get
the errors

 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

and my ISP connection fails. If I su to root at
another xterm window and go back to the non-root
xterm and use kppp I get no errors and the connection
succeeds.

The file /etc/pam.d/kppp looks like this

#%PAM-1.0
auth       sufficient   /lib/security/pam_permit.so
auth       required     /lib/security/pam_pwdb.so
session    optional     /lib/security/pam_xauth.so
account    required     /lib/security/pam_permit.so

Does anybody know what could be wrong with this setup?

Thanks,

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Heres what I do to work around on this.  I open up a terminal, su to
root, and type "xhost +" (without the quotes of course).  Then kppp will
run as a regular user.