RHEL 6 : KDM don't work with VNC

[Thierry Leurent]

Hello,

I configure a RHEL6 server.
I remove Gnome and install KDE including KDM.
I can log me localy but when I use VNC to make a remote connection, I have a 
black screen into my VNC Client.

In /var/log/message I have:
Sep  7 14:39:54 oprod-pay xinetd[1986]: START: vnc-server pid=2748 
from=::ffff:128.1.120.250
Sep  7 14:41:49 oprod-pay kdm: localhost:1[2801]: Cannot connect to 
localhost:1, giving up
Sep  7 14:41:49 oprod-pay kdm[2140]: Display localhost:1 cannot be opened
Sep  7 14:41:49 oprod-pay xinetd[1986]: EXIT: vnc-server status=1 pid=2748 
duration=115(sec)

In /var/log/kdm.log :

Invalid MIT-MAGIC-COOKIE-1 keyInvalid MIT-MAGIC-COOKIE-1 keyInvalid MIT-MAGIC-
COOKIE-1 keyInvalid MIT-MAGIC-COOKIE-1 keyInvalid MIT-MAGIC-COOKIE-1 key

Thanks.

Thierry